Product key Questions

[PoweringGravity]

I was wondering I could use a old product key from a old computer I don't use anymore, and use it to activate a newer version of windows such as 8 or 10

 

[cdabc123]

probably not. you cant transfer oem licenses. and it has to be the same os a vista or xp license dosnt work with 8

 

[GObonzo]

if it is an OEM system the key is most likely tied into the BIOS of that particular system.
if it is an install disk for Windows 7 that has the included serial you should be able to install Windows 7(guessing this what you mean by old), activate it, and then upgrade to Windows 10. a new serial will be generated for your 10 install and Microsoft will validate it.
XP & Vista do not allow free upgrade.

 

[unksol]

No

 

[bignastyid]

Depends on what version of windows it is and if its oem or retail.