Do this: ------------if this doesnt work, then you need a new comp lol.
To close out processes:
In the search bar type in msconfig
go to services tab then uncheck all unneccesary things.
go to starttab and do the same thing.
you have to restart your computer to make the changes lol.
Then, once your done, right click on computers-->properties-->advanced system settings-->performance settings-->then check adjust for best performance.
Then, download game booster, change the settings.
Run a virus scan *important* your pc might be packed with viruses lol.
Then run the game again by admin. Make sure to run gamebooster as well. (run as admin only if you have win 7 or vista, by the look of things, you have 7 right.?)
and if THAT didnt work, then just simply try re-installing crossfire.
if THAT didnt work, well you need a new pc as i've said at the top.