How to remove the tdev virus
Most antivirus programs identify tdev.dll as malware.
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Tdev.dll file information
The process appears to be part of software SmileyDistrict Optimizer by unknown.
Description: tdev.dll is located in the folder C:\Windows\System32.
Known file sizes on Windows 7/XP are 688,148 bytes (60% of all occurrences), 675,860 bytes or 679,956 bytes. 
This .dll file is a Browser Helper Object (BHO) that runs automatically every time you start your Internet browser. BHOs are not stopped by personal firewalls, because they are identified by the firewall as your browser itself. BHOs are often used by adware and spyware.
The unique ID of this BHO is F85E86D8-F796-4C97-AAA2-26664A98A42C or 0612F71E-934B-4D92-B8E8-2E29EA78EB03 or 83B14523-CBC9-447B-8B1E-2482DB2ABE73 or 6BB18EFE-F2C7-457C-81FE-705757171FA0.
The process has no file description. The program has no visible window. File tdev.dll is located in the Windows folder, but it is not a Windows core file. Tdev.dll is able to change the behavior or monitor Internet Explorer. There is no detailed description of this service. The file is not a Windows core file.
tdev.dll is able to monitor applications, manipulate other programs and hide itself.
Therefore the technical security rating is 92% dangerous, however also read the users reviews.
You could uninstall the associated program
Recommended: Identify tdev.dll related errors
Important: Some malware camouflages itself as tdev.dll, particularly when located in the c:\windows or c:\windows\system32 folder. Therefore, you should check the tdev.dll 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.
Score
User Comments
Tdev 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 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. |
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cnwin.dll cmostime.sys datasafeonline.exe tdev.dll y!multi messenger.exe iejosla.dll mydesktopservice.exe browseu.dll shlddrv.sys vipextmst.dll intelgfx.exe [all]
Nicholas