So, are you saying you have both drives in the same machine and you have a choice to dual boot??? Can't say I'd have 2 copies of the same OS on the same machine. Unless of course it was a Virtual OS, of course.
Any way, to go back to the start:
You now have your HD cam working.
You can now access the MS website.
You can access both drives.
Windows is activated.
Can you confirm that you no longer have a problem?