If you do happen to delete something you shouldn't have from your registry then don't worry. Just like Microsoft Word, your PC has an "undo" option which happens to be called System Restore. Once it's finished scanning, the Windows Live Safety scanner creates a System Restore point on your PC.
This allows you to revert your system to its original state, before you performed the scan, in case you inadvertently remove any valid registry items.
To access the System Restore Wizard in Windows XP:
1. Click Start, then select All Programs.
2. Select Accessories, then System Tools, then System Restore.
3. In the System Restore wizard, make sure Restore my computer to an earlier time is selected, then click Next.
4. Now you can use the calendar to select the date you performed the clean up scan and instruct your PC to revert to the way it was before you ran the scan.
