Can I? windows 7

[Danny]

damn... i'll buy the new computer then..

maybe ....hmmm...  alienware... D

Alienware machines are way too overpriced for the actual spec of the computer.

You're better off either building one yourself, or if you don't know how (and I'll presume you don't considering the PC you have at the moment) going to someone who builds them and choosing the parts yourself. Check out this topic for help on that.

Alternatively you could go into the supermarket and buy one from there, if you're not too worried about the parts you'll get.