Virus: All dirs & files marked read only

Yesterday I started having problems with my computer. After some investigation I found that all directories & all files have been marked as "read only". Tried going in and turning off read only but as soon as I hit OK and then look again it's back to read only.

Assume that I've picked up some kind of virus. Have run Nortan AV wiht virus definitions dated 1/27/2006 but it's not finding anything. Cannot download any later definition file cause the existing file is marked read-only.

My system is Windows XP SP2 with pretty much the latest updates.

Any suggestions on what to do next?

Thanks

 

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