I really need help

**WARNING** This will may be a long story!

Guys i need help ok. I'm taking a laptop with me to somewhere..... and i love to play crossfire. ont get me wrong, but crossfire is one of the best fps out here. It works so great on my destkop pc that i put it all all on high and just love the grahpics. so this laptop is Vista and i have a few problems. first problem is that when i start the game it come up with a black screen and on it tit have the words crossfire not repsonding and if you click on it it will exit crosffire. but if u wait crosffire will load up now that kinda is not a problem but i really want to fix that. the 2nd problem when i play crossfire the moments are very choppy on this computer and it feels kinda slow plz i beg u guys to help me i checked and this computer meet the requirements

it have intel celeron and 2048 mb of ram
2.58GHZ also

i really want to play this game but i dont kno what to do try it in combalitiy mode i did for
Windows xp (sevice pack 2)
and windows 2003

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