Upgrading from Windows Vista to Windows 7

[NagsHead]

I want to upgrade my computer from Windows Vista Home Premium to Windows 7. I've run Windows Upgrade Advisor and my computer meets the basic requirements. I want to avoid a clean install. Can I use an OEM version? If not, what version should I be looking for? Thanks!

 

[geofelt]

I think you want a upgrade version, but they are hard to find.
This is what it looks like, and I see that supply and demand has inflated the price:
http://www.amazon.com/Microsoft-Windows-Premium-Upgrade-Version/dp/B002DHLUWK/ref=sr_1_13?ie=UTF8&qid=1420173759&sr=8-13&keywords=windows7+home
Upgrade is better than oem because it is considered as retail and you can move it in the future to a new motherboard. Upgrade normally costs the same as oem.
Upgrade in place may or may not work well, so protect what you can first.
And, you can only upgrade 32 bit to 32 bit or 64 bit to 64 bit.

I might suggest that this might be a good time to also migrate to a ssd,
Clone your current hard drive to a ssd and work with that.
Then, if there is any issue, you still have your old hard drive as backup.
Look for Samsung or intel first, they have free clone utilities that work.