k...ur comp. has been infected by a virus called 'brontok'.
wat u do is use a task manager, but most probably the windows task manager wont' be working.
So download the trial version of System Mechanic 6 and use the manage running programs task to go to the running programs directory, once there disable " isass, winlogon, and services which are marked in red." in system mechanic. then go back to the browser which opened and delete those files.
Now. you can use regedit.
To delete the keys which brontok uses. which are both in the hkey current user and local machine in the directory ---- software-microsoft-windows-current-run and run once.
next and last step is to delete the dos based executable file which is located in documents and settings - (user) templates folder. and you're done.
Hey, man best of luck! though most probably this thing will work....i am not 100% sure abou it.
And do tell me if it worx.