Since I connected to the internet after having my pc repaired I have been getting a box popping up saying my Windows product needs activating, I click YES and it then informs me that my product is already activated click EXIT to continue, and for the last 6 days of the count down the pc had booted up normally.

Now when I click exit it goes to "Trevor log on" this has never appeared before, when I click to log on it goes to the "Your Windows product needs activated" and starts the loop again, so making my pc inaccessable.

When I went to the shop that repaired and re-installed my system they informed me that they have had the same problem recently with several clients and to repair the problem the pc will have to be reformatted at a cost of 50 euro, which bothers me that I must pay for a problem that Microsoft have created.

Since I have had this advice.

You say that you had your Computer repaired.
If they reinstalled the Operating System, it has been re-formatted.

If anything was changed in that Computer, it would require Re-Activation.
And if you changed any Hardware, or the Bios was altered by them, it is not the same Computer that Vista was installed on.

And re-activation after a change is not straightforward.

Do the phone option > hold on for a real person > explain what you have doner and what has happened..

http://www.microsoft.com/windows/windows-vista/quick-start/activation-fa...