Installed by interlink intervideo player
  Dominique  

I removed it and lost my optical drives (windows could not find)
   

Listed as a driver for samsung DVD burner, but is digitally unsigned.
   

Padus, Inc. is a leading developer of professional CD and DVD duplication,
  Bill  

Installed by nstant media Nvidia DVD decoder
   

I think that is a Pinacle Studio 9 file
  Cuk  

I removed it, and my 2 DVD player/burner could not be found by windows
  oldbrazil  

Installed by Adobe Encore 2.0 on XP x64 - BSOD every boot
   

optical drives need it else it can't be work
  POP  

Lower level filter DVD/CD driver installed by intervideo
  Camo  

das mein Magix Video deluxe es braucht und meint nix zu machen weil pfs.sys veraltet ist.
   

I removed it and lost my optical drives (windows could not find)
  Mauro  

appeared after installing intervideo
   

installed with ACDSee Multimedia pack
  Dicksp  

Somehow I lost it, or it became unsigned or something and now my LITON CD ROM doesn't work!!! :(
  Tom  

adoby audition driver
   

Nvida Pure Decoder
   

once ya have installed it ull need it 4ever.
   

A quick google of the file turns up a zillion hits on CD/DVD players. It's only important if you want your toaster to work. :)
  Runaway1956  

It is a samsung DVD driver
   

I agree with the Pinnacle Studio verdict by Cuk - the only software out of all the abiove comments that I have on my system
  Chyro  

It is installed automatically with Photoimpression 5. Part Of Epson Scanner 3490 (& others) installation CD.
  The Monster  

DVD Lab Pro installed it
  mutt  

optical drives disappear when pfc.sys is disabled
  JC_N  

Installed by InterVideo products that include cd burning capability, such as WinDVR, WinDVD, etc. May cause incompatibility with other burning software or dvd/cd drives. If don't mind disabling cd burning in such apps, can remove by deleting pfc.sys, deleting the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\pfc, and removing pfc from LowerFilters at HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Class\[the key for "DVD/CD-ROM drives"].
  Scree  

I think it is a file which will be created while a software in relation to the use of CD/DVD. So it's not dangerous and better not to delete it .
  Tony  

Uninstalling InterVideo, said not needed anymore. I kept it in case..
  RFunk  

belongs IMO to windows - i lost my CD-Drives if i did not start it
  RanuKanu  

This is Padus ASPI shell which lets the Pinnacle software write to multiple drives at once.
  FabioC  

Came with preinstalled software, all virus and spyware scans negative. Have no troubles.
  UMLGuy  

I removed it and lost my optical drives
  Tunay Durul  

it is not dangerous but it's very problematic/ i have some problems with writing dvd+-r/rw discs on many computers after pfc.sys appeare. i have not been able to determine which programs installs that driver/
  QWERTY_rus  

It uses C/C++ programming to enhance CD/DVD software hardware functionality
  mark   (weitere Info's)

Video driver required to play DVD's
  Allan Barker   (weitere Info's)

Padus ASPI Shell is just a Video Driver for DVD programs. You must keep it.
  Allan Barker  

I'm pretty sure it's installed by "Sonic MyDVD". I did not try to remove it. It is not possible to verify its signiture. May be related to Roxio (who own sonic)
  WOFall   (weitere Info's)

seems that clonecd also installs this; errors out on Vista
  ultramage  

I removed it and lost my DVD (XP 64)
  Alex   (weitere Info's)

that it is messin with my system. think turnaround time 4 sftwr dev is tweaked Short, so no time to deploy to cust successfully. PITA
  Dr Zen   (weitere Info's)

if you have tried WinDVD and then uninstall it, your burner will no longer recognize unformated CDRWor DVDRW, Had to delete it, remove the keys, go to thedevicemanager, select the burner, delete it so that its driver gets disabled and uninstalled, then reboot to have the DVD recognized again without PFC.SYS in the list of files for the DVD driver. Anyway, It's not signed. Causes just havoc with other burning softwares. Nor dangerous by itself but works only with some specific burning softwares that need it (I wonder why WinDVD requires it for reading a DVD, but it breaks burning)
  Philippe  

Seemed to be installed with Nvidia Purevideo Decoder
  Growler  

Causes Crysis to crash in Vista Ultimate x64 Delete it. Vista doesn't need it anyway.
  Wm Rickert  

Wird mit dem DVD-Encoder von nvidia installiert
  F.-X. Lechner  

It was installed during ACDsee complete installation process
  Hngry_photog  

Crashed my Win XP64 - \SystemRoot\SysWow64\drivers\pfc.sys has been blocked from loading due to incompatibility with this system. Please contact your software vendor for a compatible version of the driver.
  Ooops   (weitere Info's)

its a aspi driver for windows xp (32-bit) needed for (virtual) cd/dvd-drives
  Massareal  

Adobe Audition installed it. My dvd-burner lost possibility to burn Philips dvd-rw discs. But now I'm afraid to unistall it, because perhaps Audition will not work anymore.
  Naccherino  

This was probably installed on my system by Adobe CS4 Design Premium. Windows 7 Pro x64 refuses to run it, giving an error in the System log saying it's incompatible. It doesn't seem to have broken anything however.
  Chris  

Installed with Adobe Premiere Pro 7.0 for Windows. 1 Download FilterFix.zip, unpack and run it with administrator rights, select the pfc filter and click remove, rename or remove \Windows\System32\drivers\pfc.sys or \Windows\SysWOW64\drivers\pfc.sys, Reboot system.
  Peet   (weitere Info's)

It was installed by Nvidia Video Decoder
  Madison  

Biggest BS out there along with Adaptec ASPI and SPTD. SPTD will and can stop pc booting. Nothing to do except remove it manualy if can. Or replace with backup 'you have been warned'. All of the above including elaborate bytes elby driver can slow down cd, dvd, blu-ray and bdxl reading and writing. Again you have been warned, sorry for warning but it is important to not. SPTI as installed by microsoft is the best there is. No joking use nothing but that. If need an aspi layer try use nero aspi.dll search for it on nero site it is free. Place it in software folder and it should use it from there, or tell software to use it from there. That is all there is to know for keeping your microsoft os running in perfect health for optical drives. Another thing try get in the habit of unpacking in virtual memory or a sandbox to know the installer contents. Or better still ask your av, malware, trojan etc software company to detect instalation of these device and to notify you so can make decision to install product or not. Doing this will no doubt make those softwares think twice and maybe put a option to install or not, that is allow on os at all. Maybe then they get the idea that SPTI or nero.dll aspi is the best to use. Actualy I don't use nero, I prefer ImgBurn becuase it is better. Use other freeware tools for conversion if need video or audio done. Far faster than relying on nero bloat ware. Scuse if this upsets anyone, better to tell the truth than not to. Dangerous rating because they can stop pc from booting. Also make only coasters and have an optical drive that seems as if it only reads slow, one or all problems can happen.
  Not these drivers on any microsoft os  

reading of the pfc.sys in notpad: de junking This program cannot be run in DOS mode. C:\Bonanza\Drivers\Pfc\Driver\Win2KXP\objfre\i386\pfc.pdb \ D e v i c e \ P a s p i 0 \ D o s D e v i c e s \ P a s p i 0 ntoskrnl.exe HAL.dll F i l e V e r s i o n 2 , 5 , 0 , 2 0 1 L e g a l C o p y r i g h t ( C ) P a d u s , I n c ... ntoskrnl.exe and HAL.dll can be fond in system32 you cant load ntoskrnl.exe in win7 coz its 16bit i dont see how Nvidia Video Decoder will need this!
  HELPER