Most likly its your registry, try a scan and clean, for some damn reason that game plays hard on the reg, You can get a free reg scan and cleaner from searching google for it or try here,
http://www.registry-cleaner.net/ or here,
http://www.pctools.com/registry-mechanic/ which ever you pick.
By the way, welcome to the forums, you somtimes have to wait a lil while to get help here, so no need to double post. If that does not help you, get back and we will try to figure out somethings to help you..