If it's a brand new system, call Dell and they'll walk you through a system restore (HP/IBM/Dell usually have a partition where they have an image of the system as it's shipped so they can restore it back to that point).
If you have any data, boot up a Live CD (hopefully the antivirus software has it or you can download a different types of Linux ones), stick in a USB drive, and copy your data off before doing the above...
After doing that, buy a copy of TrueImage run it before any windows updates, etc. on the system drive. You'll be able to undo anything easily...
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