I keep getting the following error message when I try to restore my XP install by doing an upgrade: Error: Setup had problems registering the following OLE control DLL: C:\WINNT\System32\initpki.dll Contact your system administrator, who may provide assistance in diagnosing this problem. The next error below this is: The signature for Windows XP Home Edition Upgrade is invalid. The error code is 426. The service has not been started. What service? I tried registering the dll manually using regsvr32 but it didn't help. Any ideas?