I have a file named 400 in the temp directory. AVG PC Tuneup wants to remove it but is locked. Were do files in this temp directory come from? Can I unlock and remove the file and perhaps the directory? I am concerned that this is some type of virus or spyware?
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Try updating to the latest version of Sun Java here:
http://www.java.com/en/download/download_the_latest.jsp
Uninstall all older versions from Add/Remove programs.
http://www.talkroot.com/tech/index.php/t-1158_JRE_1.4.2_02_hsperfdata_SYSTEM.html
Are you sure the dllhost.exe isn’t part of MS Shadow Copy Prpvider?
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/xpehelp/html/xeconcomponentizedwindowsservices.asp
Run CleanUp! to vigorously clean up temp files:
http://www.stevengould.org/software/cleanup/