version of windows from key

[sswats]

I bought a used laptop.
The windows key is faded but i can make it out. unfortunately the version of windows is too faded out to tell which version its supposed to have..

The windows installed has a totally different key to the one on the base so i want to wipe it out?

Anywhere i can write in the key and it will tell me what version of windows i should be installing?

 

[sswats]

i need to write in the key somewhere so it can tell me which license it is. so i can nstall that version to the PC.

The current windows installed is a pirate and i would like to remove it. jelly bean would just give me the key to that version installed right?

 

[sswats]

nevermind. It had a recovery partition

forgot to check earlier.