Error 1635 = Error 0x663
// MessageId: ERROR_PATCH_PACKAGE_OPEN_FAILED
//
// MessageText:
//
// This update package could not be opened. Verify that the update package exists and that you can access it, or contact the application vendor to verify that this is a valid Windows Installer update package.
//
#define ERROR_PATCH_PACKAGE_OPEN_FAILED 1635 L
The MSI/MSP files can't be opened.
Remove .net framework with the .NET Framework Cleanup Tool :
http://blogs.msdn.com/b/astebner/archive/2008/08/28/8904493.aspx
and install .net Framework 1.1 Sp1 again and install the Update again.
"A programmer is just a tool which converts caffeine into code" CLIP- Stellvertreter http://www.winvistaside.de/