|Laptops often use the same mboard for different specific models, so if a similar model that uses the same mboard uses a faster cpu, you can use that faster cpu too no problem, if the cpu is removable, but you would probably have to find yourself the proper used cpu on the web. |
At best, upgrading to a 2.4ghz cpu from a 2.0ghz one will yield you only a 20% performance increase, and it may not cure your problem of the particular game crashing. Games tend to have more bugs than most other software, and it's well known they do not work properly on all systems that at least meet the minimum requirements for the game.
If your computer has 512mb or ram or less, adding more ram will help and is much easier to do, although you won't likely see any additional benefit for more than 2gb.
"Also if I delete any games, etc. will it raise my CPU?"
Programs that are not running, deleting or un-installing data that is taking up space, has zero effect on the performance of your system, as long as the hard drive partition Windows is installed on has more than the minimum free space required to run Windows as fast as the system can, other than the more data there is, the longer it takes for certain programs to finish running - e.g. Defrag, anti-malware full scans.