I'm currently running Windows XP (SP3)and am trying to run the Windows 7 Home Premium upgrade. Each time the installation gets to the point of starting to erase the XP program files and load the Win 7 files and stops with a statement that it doesn't recognize the C partition where XP is installed. The PC has a single SATA HD with only a single partition. Is there some step that's left of the installation instructions that I could be missing?