vista is installed but won't accept my product key?

[crusher_craig]

I had a friend play with my laptop so that the thing would run a bit quicker. After a month or so of use, it appears i can't use it any more because it requires a product key. so i tryed the product key on the sticker on the under side of my laptop (from when i bought the laptop) and it won't accept it. is their any way i can use this key so i don't have to buy another one but
i have no discs for it any help would be great many thanks craig

[Laser]

Give Microsoft a call, they can fix you up over the phone. I did it when a BIOS update caused the windows activation on my oem system to de-activate. Took less than 10 minutes.

[crusher_craig]

thanks very much i'll give it ago tomorrow

[cohen]

If it has already been activated before it won't accept the key because it has already been used / being used.

As said above, give Microsoft a call and they will give you a new product key.

Good Luck,

Cohen

[ijaz ahmad]

i have a key butt this time this key is not accepted by my computer.
please help me in this case
regards

[caperjack]

i have a key butt this time this key is not accepted by my computer. please help me in this case regards

call microsofts 1-800 number