Yesterday, I was trying to install Virtual PC for Windows 7, but it was taking ages to install. I even left it running overnight, but all it said, was:
Initializing installation... done! Installing Update for Windows (KB958559) (update 1 of 1)...
I have just found this forum post that suggests un-installing any antivirus software, and then trying again:
Therefore, I disabled the anti-virus software that I had running, and the installation started working.
🙂 🙂 🙂