In this case I would consider virus as extremely remote as I run AV protection and problem has been around for a long time. See my reply to Sergey for details.

>>
>>Anyone know the cuase and cure of this?
>>
>>Thanks,
>>Bill
>
>Boot in safe mode, or better yet from a clean AV boot CD, and run anti-virus checks on the machine. This behaviour is sometime related to AV/Worm infection.