Lately I've been having a bunch of problems with my system. Everything will be fine, but then I get an error that says I dont have access so and so to whatever program I had running (it differs each time). Then after I get the error, my interface seems to change. The program icons all change, i cant see drop down menu options on anything, whenever i type something it shows up blank, and when i try to shutdown, my xp shutdown menu seems to turn into the same graphics windows nt/2000/me uses. I've used kaspersky, ewido, ad-aware, trendmicro, mcafee, panda etc and still no luck. Bitdefender did find something, but cant seem to delete it. BD found a trojan downloader in the system volume information folder, and i tried to delete it manually but it would not let me. The file i tried to delete is called change.log, and it keeps giving me the error saying so and so is being used by another process and cannot be deleted. Meanwhile I have nothing running but csrss.exe and winlogon, and it still wont let me delete the file even through command prompt. I dont know what else to do.
ps: i also posted my HJT log on the hjt forum.