Loading settings fails (Access is denied) for domain accou..

Hello!
I reinstalled Windows XP Pro SP3. Local accounts work fine. But domain
accounts do not have access to many files in the c:\Windows and c:\Program
files folders and cannot load a profile. I had given the domain accounts the
administrative rights on my computer. The security tab in the files
properties show the administrative group has full access to the files. But
when I double-click on the files a message appears that the account does not
have the access: "C:\windows\system32\wupdmgr.exe
Windows cannot access the specified device, path, or file. You may not have
the appropriate permissions to access the item."
Uninstalling SP3 allows access to files in the c:\Windows and c:\Program
files folders. But I still get an error "Windows Script Host
Loading your settings failed. (Access is denied.)" after logging in.
How to make domain accounts have an access to the files?
Best regards,
Dima