You may have what some refer to as the "hostage trojan". Have you had a demand for payment of a ransom? Look at info in the two links below.http://www.securityfocus.com/brief/162http://techrepublic.com.com/5208-6230-0.ht...ssageID=2002837
You may be able to post a Hijack this log in the Hijack this forum by changing the name and the file extension.
Scroll down to instruction #9 in the link below. It will install in the proper location and is self extracting.http://www.bleepingcomputer.com/forums/t/34773/preparation-guide-for-use-before-using-malware-removal-tools-and-requesting-help/
If you have a problem getting HijackThis to run, try renaming it to something else like "myscan". If needed you can also change the .EXE to .BAT, .COM, .PIF, or .SCR. All all are valid for renaming it.
If you can't get on the internet then you will have to load Hijack This on to a floppy,etc. from another comp.