Use Upgrade License key after install of other?

I upgraded a Vista PC with a license I had already used, with the plan of testing some specific software before deciding to stay with Windows 7 on that particular PC.

I am ready to purchase a license, and I see some in some online shops for 'upgrade from vista'. I didn't realize that type of license was available.

My question is, does anyone see any reason why I couldn't purchase one of those, and just change the KEY from the properties of the computer then register? The existing license I installed with was a full version.

You can try inserting the new key at the activation link at rightclick Computer>Properties,

or click on start, type CMD in search box, rightclick result to Run as Admin, type
slmgr.vbs -ipk <insert your new product key here>
Then to activate windows after changing the key, run slmgr.vbs -ato

If it rejects key then run a Repair Install of Win7 which resets activation and accomplishes the necessary "upgrade" (over itself) to allow use of Upgrade version key.

Thanks!

In general, be cautious when purchasing a key from an online retailer. There are many scams out there, and you don't want to end up with a faulty key that results in a non-genuine Windows 7. Just remember it is always best to purchase from a reputable retailer or Microsoft Partner, and if something seems too good to be true, it likely is :)

Cheers,
Cassandra
Microsoft Windows Outreach

The advice re: purchasing is good. I never purchase from online companies that I cannot research from at least 2-3 different sources for reviews of the reseller. And unless it is well known to be good, for example New Egg, I don't purchase if there is no phone number to call.

That being said, after the initial responses about using the license above, I have made my first time purchase from a site this morning, which did meet my criteria above. I don't do that often. We'll see if I get burned.

Wish me luck :)

The best mainstream price for Home Premium Upgrade I'm finding is $105 US.

Anyone find better in mainstream?

I've beat that by a little bit for a Professional Upgrade, not full license. But it remains to be seen if I get burned or not.

Perhaps you can post a link to the Win7 you bought so we can have a look.