If it can run Crysis it should devour those other games. While I wouldn't suggest a reformat right off the bat
, we definitely need to look at some things.
How much RAM do you have in your computer?
Since you just bought the computer, I doubt that you are having dust problems. it wouldn't hurt to open it up and look, maybe go ahead and blow it out.
What graphics driver are you running (version number)? Since you are running SLI it is very important to use the latest drivers to keep you performance at its peak with new games.
Unless you have really crammed stuff into it, your hard drive shouldn't be full. Check to see how much room it has left. Also along this line, do a defrag. While Windows has a defrag built in, I prefer to use O&O for mine, but the Pro edition is not free. Give Defraggler
a shot, or Auslogics Disk Defrag
. Both are free.
Go ahead and run a spyware scan or two. Use Malwarebytes Anti-Malware
a spin for it.
Double-check your anti-virus. Try Trend Micro HouseCall - Free Online Virus and Spyware Scan - Trend Micro USA
for a free online scan with one of the top AV engines.