I had activated my copy of windows 7 two days ago by simply entering the key I received for the copy I bought.
Everything was alright until I had to do a system restore to a restore point 4 days ago today.
Now my windows thinks its not validated anymore. However, I no longer have the option of entering the CD key in the system options where I should usually be able to. It is like my system reverted the fact that I activated my copy, but not the fact that it didn't need activation anymore (so that the option is not there anymore, but its also not activated...)
How can I fix this?