If you are always getting Access Denied errors when trying to connect to a XP computer, and you know you have the correct user names and passwords on the computer, the solution may be a simple registry edit.
02. Go to HKEY_LOCAL_MACHINE / SYSTEM / CurrentControlSet / Control / Lsa
03. Change the value of a key called "restrictanonymous" to 0 instead of 1
04. Don't change "restrictanonymoussam" value.