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For anyone else with this problem the following worked for me with the vundo.b trojan/virus in XP
1 Turn off Systems Restore
2 Download the norton removal tool as stated above
3 Start up in safe mode
4 Run a nortan scan as usual
5 Run the removal tool software
6 Reboot as normal
It may be necessary to try the safe mode scans and reboots several times. I also deleated the registry entries as suggested by norton.
I got rid of the bugger but it took the best part of a weekend
Grrrrrr
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