Fats said:
I bought this computer with Windows and MS Office installed from my employer and I should have a license via my employer.
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Nah, if you bought a computer and it happened to have some software on its not down to you transfer the license. After all its still licensed and paid for, just in someone else's name. Its down to the person whose name it is licensed to - to report the license code/key as expired to the software vendor so the vendor can de-activate the software. And then if the new computer owner wants to continue using the software they then can buy a new license.
(In an ideal world)
Just like if I sold a car to someone else in the UK, I wouldn't just give them the car and the plate, I would tell the licensing authority (in this case the DVLA) that I no longer own (licensed to drive) this car.