Can i ask you y u need to do this?
Yes primarily just to try Win 7.
However, I have an old case built about 7 years ago and it has it's problems (found ways to work around these) and the MB can no longer be replaced. It runs Win XP and does an great job. I can live with XP the rest of my life. It is the best OS I have ever worked with.
When Vista came out I was able to install it, knowing that my case did not have the hardware to do it justice. After several months of fiddling around with Vista, I decided it was not for me. Reason I did not care for Vista was mainly two fold: 1. Too much security, it asked two or 3 times if I was sure I wanted to do something (once is enough). 2. IT was just too dang slow. (had 2 gb of ram).
I recently built a case (not the most sophisticated in the world), with a 300gb sata HDD, 2gb of ram and uses onboard sound and video. IT does NOT have connectors for ide or sata burners or extra HDD's. It does however have many usb connections that work fine. Like I said "not sophisticated, but very economical". The OS installed (don't laugh) is a MAC.
There is really no way to install Win 7 on the sata HDD.
To buy a second HDD and switch out HDD's each time I want to run a different OS is physically challenging for me.
Yes I would love to try Win 7, is it necessary? NO
Would I purchase a PC with Win 7 on it? For personal reasons probably not.
Would I build another PC that could support Win 7? Perhaps, but I would probably stay with Win XP.
Over the years I have discovered that Newer is NOT always better.
Thanks for listening... Have a great day.