Dude just download the pirate WINDOWS 7 ..
1) First install the download os
2) Then download Win 7 activator
3) You got win 7 activated for free hooray!
It is totally depended whether you got PCI-Express slot or not , i myself upgraded my cpu from Intel chip set to Radeon HD 5450 .... If u can reply back and give information about your motherboard than i may help you buddy !! PARDON MY ENGLISH