Ok what is the make and model of your CPU then? We need more to go on. Without the make and model we can't tell you were to go to down load drivers. Once we know the make and model we can point you the right site for your drivers.
If you don not know what it is or how to get it then run the following programs which will tell you this information...
GPUz
http://www.techpowerup.com/gpuz/
and CPUz
http://www.cpuid.com/softwares/cpu-z.html
These will tell you which GPU and CPU you have so that we can point you to the right drivers.