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Windows crash after i delete a software

I am running XP-PRO,512MB,30G-HD with 800mHZ.4yrs of nearly perfect operation.I download a powerboost software(PC Mighty Max) and all was well. This software had no uninstall and add remove could not remove it. I used Regcleaner to removed the software and upon reboot i got killed. Error message is "Windows Product Activation... A problem is preventing windows from accurately checking the license for this computer. Error code:0x80070002"
I restart in "Safemode" and select restore but restore window opens and do nothing. Norton does the same and AVG7.0 has completely disappear.
What is my next move folks

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(NT) (NT) System Restore?
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System Restore - Coryphaeus

I am not sure if you're responding to my post. but please read carefully, because i am quite sure that i did mention that restore only open with a blank screen and nothing moves

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Sounds like time for a repair installation

Regcleaner is not meant for removing software installations. I don't think it will be possible to determine the extent of the damage but you might be well off to do a "Repair" installation if this is not a proprietary machine such as Dell, HP, etc. If it is, you will need their recovery disks. If it's a custom built using OEM or retail software packages, you can boot from an XP CD and follow the instructions to do a repair installation. This will not format your drive or cause loss to data that's not already damaged. If some applications have lost needed files, you will need to reinstall those. You will need to reactivate Windows so be sure to have the product ID code handy during the process. That's about all I can offer.

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Sounds like time for a repair installation

Thanks! will try that before i do a clean install

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