I am not able to install the retail version of Windows Vista as an upgrade that I want to do from the RC installation. When I am trying to do the Upgrade Install then it warns me that some programs will not work after installation but it wont affect the installation of the OS. So, I start the setup and all the files are copied and when it reaches 100% then immediately after that it changes to expanding files 0% and then I get an error that says "Windows cannot install require files. Make sure all files required for installation are available, and restart the installation. Error code: 0x8007001f". Can anyone please help me out of this problem?
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