Windows XP: c:\windows\system32\gxvxccounter

rootkit + meaningful description.

you have a rootkit infection mate, we all want to push these unwanted entities to the edge and kick them off because they are no good and lack any use at all, they deliberately get on peoples nerves and take the fun out of computers. mark my words, nobody likes them!

http://www.antirootkit.com/software/IceSword.htm
http://technet.microsoft.com/en-gb/sysinternals/bb897445.aspx

you need to disconnect from the net and disable all your security programs. that means disabling the services through services.msc and rebooting. simply because security progrms can employ the same methods as rootkits, so you dont want to get mixed up.

icesword, pay particular attention to the "programs, services, SSDT, startup, kernel module" sections. anything in red is hidden. post all that you see in these particular sections. names and image paths.

rootkit revealer, do a full scan and export the results to a text file, you can post them here.

rootkits are quite easy to unhook, disable the service and reboot, then remove all the files that were accompanied by it.

but first you need to decipher if you actually have one.