Why don't you post your actual config?
But anyways Alienwares will have a decent GPU. Do the following:
1. Run a scan and clear out viruses
2. Defrag your HDD.
3. Clear out your cache and clean your registry.
If the problem still persists open up the back case and use a blower to take off lint, dust etc. It makes a difference.
Let us know what happens mate!!!!