My system was running fine with below specs
Core2Duo 2.66 GHz on Digilite G41
6GB DDR3
250 GB SATA
Zotac GTX 650 Ti
Frontech 450W PSU
Win 7 Ultimate 64
My HDD crashed and I replaced it with a 1TB SATA. Since then my system goes unbelievably slow when I install the NVidia graphics driver...