Turn off System Restore:
On the Desktop, right-click My Computer.
Click Properties.
Click the System Restore tab.
Check Turn off System Restore.
Click Apply, and then click OK.
Restart your computer, turn it back on.
On the Desktop, right-click My Computer.
Click Properties.
Click the System Restore tab.
Remove the Check Turn off System Restore.
Click Apply, and then click OK.
Double-click My Computer.
Click the Tools menu, and then click Folder Options.
Click the View tab.
Check "Hide file extensions for known file types."
Under the "Hidden files" folder, Uncheck "Show hidden files and folders."
Check "Hide protected operating system files."
Click Apply, and then click OK.
Keep your system up to date and run Adaware & Spybot, once a week works, and hopefully you will be ok from here on. Both are available below.
Safe Surfing.
I would also suggest you read this:
So how did I get infected in the first place?
by Tony Klein