Help! After re installing XP I am unable to access the old "my documents" folder.
When I open 'Properties' and click on the 'sharing and security' tab there is no 'security tab'!!

How did you re install XP?

When you say "the old "my documents" folder" are you saying you installed XP to a new partition and are trying to access the old version?

Have you looked thru this guide:

http://support.microsoft.com/?kbid=308421

Note that with XP Home you have to be in Safe Mode to use the above steps.