Hope you are well, thanks for your birthday messages I had a great day. I do still browse the forums although not as often as I use to due to most of my time taken up by college studying etc.
No worries happy to help. :)
You may also find these links useful on how to do a clean install with the Windows 7 upgrade media. Also the second link shows how to solve the activation issue once you have set it up again...
The reason your PC is shutting down is because MS have stopped supporting Windows 7 RC it expired in June 2010 this link also gives some more information.
If you remove the service pack from your PC it should still be ok but to be on the safe side I would backup any data you need...
I also have an Iphone 4 currently running 4.3.2 software and I'm looking at Jailbreaking it.
V_R, I see that you have done this to your current Iphone 4 is this easy to do if so could you let me know how you did it?