What IncandescentLight said is mostly true, however it doesn't really restore all of your files, nor is garenteed to remove the trojan. It will only reset the main vital system files, installed programs (as long as they are recorded- however viruses can mask these by deleteing the entries), and your "personal" data found in your user profile. I would suggest attempting it however, followed by resetting your registry values by pressing f8 on boot up, then selecting last known good configuration- it will auto load the registry keys (only from HKLM\System\CurrentControlSet- so it might not help either) and drivers from about a week before normally (or the day before the 'restore point'). Following this I would suggest running the normal antivirus/spyware removal programs to see if they can remove any other occurances.
Also google the specific findings after you have done this, and see if there are manual removal processes that you can follow to make sure you get rid of the infections.
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