[rictus01]

given the situation you're in I take it you don't run any virus software/ spyware detection, or open files you don't know ?

for a start, don't open anything you don't know (most trojans require you to start them).

stop any processes you don't know ( ctl+alt+del - task manager) either buy or download a virus protection program, install make sure it's up to date.

switch off the pc, disconnect the PC from the internet safe boot the PC F8 use the virus scanner to scan it's host directory and clean it if required, if it has a boot option use that if not boot to command prompt and go to the scanners directory and use the commands from there, once it's scanned the whole machine restart and normally boot up into windows, scan again to be sure.

try running Zone alarm or another firewall program so you can choose what programs access the internet.

the above is general stuff, but nothing will help if you don't use a little common sense in looking after the machine.

Cheers Mark.