Could you please post your system information?
The way to post your system information is going to Start > Run > and type DXDIAG, a message will popup just click yes then either take a picture ( use printscr above the numberpad or next to the F12 button ) or do SaveAllInformation then attach it to your next post.
Then try this:
http://www.systemrequirementslab.com/referrer/srtest
You have to download the ActiveX from the site for the test to work.
Run a test for [Name]
If you get recommended you system is awesome!
If you get a minimum pass then upgrade your system to the stuff it needs ( videocard, RAM or something else like that )
If you fail do the same for the minimum pass results
Hope I helped