it can take a while to load if you have a small hard drive or it is near full, if your on a laptop most laptop drives spin at a rate of 5400 rpm with a 30 mbps data transfer speed where as a desktops hard drive can spin at 7200 rpm with a data transfer of 60 mbps, so if you just leave it and wait (i know you may be eager to playz

) but that is teh best thing you can do, also sometimes when a application goes into fullscreen it can mess with other applications and fill your ram with crashed data files ect ect, so before opening the game close any anti viruses you have firewalls or loose processes off. if you need further assistans PM me and i will try to help you out.