I bought a pc that has win7 ultimate installed... updated ive made a new installation of a new ssd, don't know what previous version of windows was on the system before

How do ifind what version of windows I had before it has been upgraded to win 7 ultimate? I have had this for 1 year (bought secondhand) no probs, just updated my pc and installed a new and it does not accept the cd key? If it wasn't authentic I questions since I use first, so why question now?

Please help as I can't be bothered giving microsoft £130 for the inconvenience
I just go through the most popular versions and see if I have the chance? or are there easier ways to detect previous versions?
Thank you

The only way to know is to contact the original owner or check the chassis of the machine to see if there is a certificate of Authenticity sticker attached to it. It will identify which edition an original version of Windows is preinstalled on the machine:

COA certificate of authenticity:

http://www.Microsoft.com/howtotell/content.aspx?PG=COA

If you do not, you may have to invest in a full version license.

Tags: Windows

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