Changing Office licence

[Amelia43]

I have a genuine copy of Office 2010 (Windows version) on my iMac which is running both Mac OS and Windows on separate partitions. This copy of Office was reinstalled three times after system reinstallations in the past, and on a laptop which I gave to a grandchild. I recently bought a new laptop, and activated this copy of Office with no problems. However I have run out of activations. I installed Parallels on my iMac, and when I attempt to use Office via Bootcamp, I am told that I have exceeded the allowed number of activations.
I can purchase a greatly reduced genuine copy of Office through my university, and would like to install it on the Windows partition to use in Bootcamp, and am happy to pay for the new licence. However, is there a non-destructive way to install the new licence, without uninstalling and reinstalling Office, or more simply change the licence to the new one? I know I can ring Microsoft and ask for a further activation of the existing licence, but for a small expenditure I can start afresh with a new licence.
Any recommendations would be greatly appreciated.
Dianne

[HansV]

Activate the Add/Remove Programs or Programs & Features control panel (depending on the Windows version on your Mac)
Select Microsoft Office 2010.
Click Change.
Click Enter a product key.
Click Continue.

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[Amelia43]

Thank you Hans. Once again, the speed of your response is of Olympian standard (of the gold medal variety) , and I am having a "why didn't I think of that" moment.
All the best
Dianne

[Amelia43]

For mysterious reasons known only to the angry gods of computing, it didn't turn out to work "as advertised"- the new key was unable to be recognised, and I was instructed to repair Office, which I did twice. I ended up having to uninstall and reinstall Office- luckily all went smoothly, with various Office add-ins all intact, and the pst file automatically found-whew!
Probably something quirky about my set-up...
Dianne

[HansV]

I'm glad you did manage it in the end.

[Amelia43]

Thank you once again.
Dianne