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hello i am having trouble getting past the training mission as it freezes up upon completing it here are my specs if they help...

HP g62 notebook pc
amd turion II p540 dual-core processor
4 gb ram
64 bit win 7
amd m880g with ati mobility radeon hd 4250.
not sure what could be the problem, any ideas?
Nevermind, apparently upping the resolution helped.