Chances are, whoever told you to re-install windows is correct. As it will be different hardware you're using, your current installation of windows will crash upon start up because it detects different fundamental hardware.
If you have a license, you should be able to download the windows 7 install file from the microsoft website.
Using just the windows 7 upgrade disc would probably not work as a clean install as that's just an upgrade disc.
If not, use the vista disc to install then just upgrade it afterwards.
Then, the best way to get drivers is to go to the motherboards website and download the drivers from there.
Hope this helps
Can I install windows vista and be able to upgrade to windows 7 with no product key, though? I have one for the windows 7 upgrade, but not for vista.