Windows XP Home - NOD32 A/V & Automatic Updates not starting up

Gentlemen, I ahve encountered this issue before, but the resolution used then isn't working now.

In short, WinXP Home (SP3) box is booting properly but A/V & Windows update, while appearing on the task bar, are not starting correctly. When I check services, Windows Update & Background Intelligent Transfer aren't there. Tried to reinstall as per these instructions on MS site, not no change (tried Service Pack folder in %windir%, then SP3 CD (not the proprietry one which came with the tower (Compaq) as cust. can't find.

Also tried a program I have used successfully before called dial-a-fix (sounds pretty sus, but works a treat) and it couldn't complete successfully as it has before.

NOD32 & MBAM indepth scans have been run in case there is a bug in the system - nothing found.

I welcome your thoughts!
Servant-LeggieAsked:
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Sudeep SharmaTechnical DesignerCommented:
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Servant-LeggieAuthor Commented:
Sorry, link for the MS website is here (forgot to add).
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mayureshtodankarCommented:
Try running GMER tool and find any malware running in background or any unknow services.

http://www.gmer.net/
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Servant-LeggieAuthor Commented:
mayureshtodankar, the scan finished and said that files were damaged due to rootkit activity. NOD32 shows a clean bill of health, however, and it should pick up rootkit activity. So, is a repair reinstall the best way forward?
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Servant-LeggieAuthor Commented:
...actually, the exact message is...:

"WARNING:

Gmer has found system modification caused by ROOTKIT activity!"
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mayureshtodankarCommented:
Yes, Try repairing or reinstalling will be a best option as these modification to system files never detected by any good know Anti Virus. You can also try stopping DNS Client Services and see whether you can start windows update.
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Servant-LeggieAuthor Commented:
Thanks guys, Gmer found the issues and TDSSKiller found it and cleared it. Immediately, the service/s could be reinstalled from the ServicePack folder in %windir% and then restarted.

All fixed!
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