To get rid of it completely, download and run a reputable spyware program (such as SpySweeper) and make sure you double check your security settings and update your antivirus definitions.
If you ever get the urge to start deleting files again and you discover that you've deleted critical system files, try running the System File Checker tool first. Just click Start --> Run and type in "sfc /scannow" in the dialog box (without the quotes).
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