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What is mup?

Mup.sys is a Windows driver. A driver is a small software program that allows your computer to communicate with hardware or connected devices. This means that a driver has direct access to the internals of the OS, hardware etc.
The free file information forum can help you determine if mup.sys belonging to the Windows system or an application you can trust.

Run a free scan to check for mup drivers in need of updating

Mup.sys file information

The process known as Multiple UNC Provider driver or Multiple UNC Provider Driver belongs to software Microsoft Windows Operating System by Microsoft (www.microsoft.com).

Description: The original mup.sys is an important part of Windows and rarely causes problems. mup.sys is located in the folder C:\Windows\System32\drivers. Known file sizes on Windows 7/XP are 107,904 bytes (68% of all occurrences), 105,344 bytes and 6 more variants. http://www.file.net/process/mup.sys.html 
The driver can be started or stopped from Services in the Control Panel or by other programs. The file is a Windows system file. The program is not visible. Mup.sys is a trustworthy file from Microsoft. There is no detailed description of this service. mup.sys seems to be a compressed file. Therefore the technical security rating is 2% dangerous, however also read the users reviews.
You can also do the following:

  • visit the vendor's support site
  • uninstall the associated program (Start > Control Panel > Add/Remove programs > Microsoft Windows)

Recommended: Identify mup.sys related errors

Important: Some malware disguises itself as mup.sys, particularly when not located in the C:\Windows\System32\drivers folder. Therefore, you should check the mup.sys process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

After downloading & installing keygen for CuteFTP, caused PC to crash.
Used to connect to 'novell' servers. 99% of people dont need this. Many people experience problems when windows stops loading at mup.sys during bootup. Can be fixed by booting with CD and repairing, or by the 'disable mup' command.
Mup.sys This is the driver for the Multiple UNC Provider, which determines which network client protocol to use when the target server is specified by a UNC path such as \\Server_Name. / Boswells Q&A Mup.sys is the service to connect to Novell servers.
When i installed WINxp sp2 its hanging with startup Windows. Then i went safemode that time I found out its hang with muo.sys
Installed Win XP Pro onto a HD hanging off an ATA133 controller card. Removing the card, and connecting the hard disk directly to the mobo removed this problem.
Multiple UNC Provider: This is a required network driver, and is completely harmless.
its a pile of pooo
People with Mup.sys problem should definitely uninstall DAEMON TOOLS from their computer, if they have it there.
My problem with mup.sys seems to be a RAM issue. I installed a ATA133 controller card and a 2nd 1gb stick of RAM, which I know my mobo can handle. I got the hang at loading mup.sys I took the controller out and left the ram, and it still hung. I removed the RAM and reconnected the controller card and booted just fine. I tried the RAM again to no avail. So whenever I add this 2nd gb of RAM I get the mup.sys hang. Going to have to look into this further
  Highly annoyed with windows  
Essential windows driver
  Bob D   (further information)
PC did not boot due to an error with mup.sys . Switched it off, disconnected it from power supply, after 1 minute connected it again and windows booted without error. strange :-/ Will replace pc as soon as possible...
A power surge appeared to knock out my hard drive. When trying to boot into safe mode, the computer hangs on or after loading the mup.sys driver. Recovery console is unable to detect c drive as a legitimate drive, giving the error: "drive cannot be enumerated". Damaged hard drive in new system brings the same error. New hard drive and new xp installation in old system brings the same error. Odd.. Still looking for a solution, but thinking mup.sys may only be the obvious culprit in a long list of culprits..
i continuously get put on group networking. All ownership taken from me. I can only read and write. My spyware gets taken over along with everything on my pc. Ive also lost my volume control. Pc is only 2 months old
  PJ Tucker  
After downloading a keygen for neatreceipt, it caused by coumputer to crash and stop loading on mup.sys. using a linux live cd, i just deleted mup.sys through linux and now there is no virus.
Its possible a virus has modified the Bios. I have 2 pc that won't boot past Mup.sys, and even putting a know fresh drive from another same pc won't boot past it.
Essential Windows driver, has shipped with windows since XP ( C++ users, DOS- Vista.ToWin7() )

Rating chart

Summary: Average user rating of mup.sys: based on 20 votes with 16 user comments.
11 users think mup.sys is essential for Windows or an installed application. 3 users think it's probably harmless. 2 users think it's neither essential nor dangerous. 4 users think mup.sys is dangerous and recommend removing it. 7 users don't grade mup.sys ("not sure about it").

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Mup scanner

Security Task Manager shows all running Windows tasks including embedded hidden functions (e.g. keyboard or browser monitoring, autostart entry). A unique security risk rating indicates the likelihood of the process being potential spyware, malware, keylogger or a Trojan.

Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, trojans, keyloggers, malware and tracking threats from your hard disk. Ideal supplement to Security Task Manager.

SpeedUpMyPC scans, cleans, repairs and optimizes your computer.

Other processes

mup.sys [all]