[Matty_]

Try putting aero (you must be using an aero theme) into the search box and click "Find and fix transparency problems and other visual effects".

Select Advanced and you can choose whether to auto repair if possible and possible issues should show up.

p.s. Your Windows Experience Index for Graphics of less than 3 aero will be disabled. There is apparntly a hack available to get it to work but as it`s an old lappie i wouldn`t be to sure. Anyway try running the WEI and update any graphics drivers.

p.p.s. After doing a bit of messing i also noticed that if in Adjust Visual Effects "Enable Desktop Composition" is unticked it also doesn`t work (as it loses aero)!