Most antivirus programs identify temp.dat as malware.
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Description: Temp.dat is not essential for Windows and will often cause problems. Temp.dat is located in a subfolder of the user's profile folder or sometimes in a subfolder of "C:\Program Files".
Known file sizes on Windows 10/8/7/XP are 830,312 bytes (91% of all occurrences) or 1,165,183 bytes.
This .dll file is a Browser Helper Object (BHO) that runs automatically every time you start your web browser. BHOs are not stopped by personal firewalls, because they are identified by the firewall as part of the browser itself. BHOs are often used by adware and spyware. IDs used by this BHO include 2C4BA31C-0C15-11E2-90C7-9BFCBEB168B3 or B78F92C8-DEB3-11E2-9A0A-FB64281D6ADE or 4 more variants. The process has no file description. The program has no visible window. The temp.dat file is able to change the behavior of, or monitor Internet Explorer. There is no detailed description of this service. The file is not a Windows system file. temp.dat appears to be a compressed file. Therefore the technical security rating is 82% dangerous.
Recommended: Identify temp.dat related errors
Important: You should check the temp.dat 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.
The following programs have also been shown useful for a deeper analysis: Security Task Manager examines the active temp process on your computer and clearly tells you what it is doing. Malwarebytes' well-known anti-malware tool tells you if the temp.dat on your computer displays annoying ads, slowing it down. This type of unwanted adware program is not considered by some antivirus software to be a virus and is therefore not marked for cleanup.
A clean and tidy computer is the key requirement for avoiding PC trouble. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.
Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.