It sounds like you installed Windows XP Home. You need to take ownership of the folder.
1) You will need to login to Windows in Safe Mode with an account that has administrative privledges.
2) Then right click on the Folder and select properties, then the security tab, then click on advanced and the owner tab.
3) Then click your username that you logged on as in Safe Mode and then
select the replace owner on subcontainers and objects.
4) Then click ok and if you receive a message about replacing permissions
select Yes.
5) Then you should have to select Ok again and then you should be able to acess the folder.
Worked4me
1) You will need to login to Windows in Safe Mode with an account that has administrative privledges.
2) Then right click on the Folder and select properties, then the security tab, then click on advanced and the owner tab.
3) Then click your username that you logged on as in Safe Mode and then
select the replace owner on subcontainers and objects.
4) Then click ok and if you receive a message about replacing permissions
select Yes.
5) Then you should have to select Ok again and then you should be able to acess the folder.
Worked4me