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Computer reboots when it goes to standby

I have a gateway desk top running windows xp home edition 2002 with SP3.
My problem is it keeps rebooting whenever it goes to standby or I turn it off using the turn computer off screen (no prob when using power off button). Other than that it runs normal.
I don"t know if these probs are related but it all started with my security software (Bell security provided with my internet) continually starting a scheduled scan every 2-3 hours when it was set to do one once a week. When I checked the scan info it knew the correct date and time of it's last scan but still decided it need to do another 2 hrs later. Then a couple of days later the reboot prob started.
I have tried deleting and reinstalling the security software with no luck. Then I deleted it again and did a system restore and without the security I still had the same prob. While doing this I wanted to switch my automatic updates off so nothing would be downloaded and found another prob .. the screen for choosing how you want updates installed has all the options in light gray (none highlighted) and I cannot change the selection from automatic.
Sorry for such a long description but I don't know if I have 3 small probs or 1 large one.
any help appreciated
Thanks

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