TASK MANAGER, REGISTRY EDITOR, SAFE MODE DISABLED.

I have four major problems with my system running XP Prof.;
1. An attack was there by Dungcoi virus.
2. I formatted HDD four times, but still Task manager is disabled. Group policy values are set as "not configured"
3.Registry editor disabled as earlier.
4.CAn not be starts in safe mode.
5.no virus scanner can not be installed / run.
please help.

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