Hey there
i also had the same problem
,,but i got it conformed from microsoft,its not the problem of coolling system or windows vista it's the laptop and its configurations,,,,,mostly for playing a game on vista or win7 than xp requirs more ram and cpu speed and trust me laptops except the cool *** gaming laptops like ALIEAN WARE
are only capable to run games properly although some games will run smoothly adn some will look like you are roaming in graveyard......
example gta4-it requirs 1.8GHz Intel Core 2 Duo, 2.4GHz AMD Athlon X2 64 or equivalent
1GB RAM (1.5GB for Vista)
16GB HDD Space
256MB nVidia 7900, ATi X1900 or equivalent
DVD-ROM Drive
and i had more than maximum require ments-win7,3.30Ghz core2 duo,GeForce GT 240 nVidian 1 gig and 3 gig ram
a assembled dell studio but still it lagged adn *** my 30 dollars
so dont play any latest mainly rock star games or high end graphic games on laptops laptops are only for working or multimedia nt for gaming except ALIEAN WARE[[
and over HEATING can cause some slaw down and only some cvlitches not a serious lag and it only happens when your system is heated untill you fry an ommlett on it joke
NJOY PLAYING LEFT4 DEAD