How to remove an symdns error
The file symdns.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 symdns.sys belonging to the Windows system or an application you can trust.
Run a free scan to check for symdns drivers in need of updating
Symdns.sys file information
The process known as DNS Filter Driver belongs to software Symantec Security Drivers by Symantec (www.symantec.com).
Description: symdns.sys is located in the folder C:\Windows\System32\drivers.
Known file sizes on Windows 7/XP are 12,992 bytes (32% of all occurrences), 12,984 bytes and 9 more variants. 
The driver can be started or stopped from Services in the Control Panel or by other programs.
The program has no visible window. It is a Verisign signed file. The file is digitally signed. There is no detailed description of this service. Symdns.sys is not a Windows core file. You can uninstall this program in the control panel.
symdns.sys seems to be a compressed file.
Therefore the technical security rating is 7% dangerous, however also read the users reviews.
It is possible to uninstall the associated program
Recommended: Identify symdns.sys related errors
Important: Some malware camouflages itself as symdns.sys, particularly when located in the c:\windows or c:\windows\system32 folder. Therefore, you should check the symdns.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.
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Symdns 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. Spyware Doctor 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
ddabb.dll winhook.dll pmkjh.dll symdns.sys brctrcen.exe cchservice.exe iebuttonbuyertoolsinterface.dll gamedrvr.exe vtsqn.dll sascore64.exe usrprmpt.exe [all]
Georg (further information)