use these key finders to find your vista basic key ifit was activated which it should be as you have used it for 2 years
read this fior genuine problems
1. click start, and in the Search box type: slui.exe 4
2. press ENTER on your keyboard
3. select your country.
4. take the phone activation option, and hold on for a real person instead of following the automatic prompt process
Or you can read the below link on how to activate vista