WEI is working fine for me Jimbo. It has even boosted up my previous score on an old laptop.
A couple of posters on Technet have said that it is a problem with your computer not being able to cope - nothing wrong with the OS. Thats fine, but doesn't gell if you had it running previously?
You could try installing an older driver version (Nvdia is it, that seems to be the culprit on technet forums?)