>>The only anti-virus I run is Windows Defender that comes with Windows 8.1
>
>This's a bit unrevelant but, I didn't use my Windows 8 key yet. I just afraid some things:
>-I have some virtual PC images, if I don't learned wrong, Windows 8 doesn't support virtual PC, it supports HyperPC. Can I use these virtual PC images with W8?
>-My currently notebook just have 8 GB ram i7 and cannot support anymore. Does 8 GB enough if I use VS2012 with Win8? I don't use VS yet, but maybe will use...

Metin,

try to run your virtual PC images in VirtualBox in your old OS. Should work. If so, you can run your images not only in W8 but on linux as well.

HTH

thomas