hi, i recently found out my old Nvidia Gforce 7600 ddr2 512mb agp card had become faulty and no longer allows my computer to run anymore. so i bought a new galaxy card, the nvidia geforce gtx460 768mb gc ddr5 192bit with dual dvi/mini hdmi/pcie card.my issue is this, it wont fit in my motherboard! i had asked a "professional" online and he told me that all the cards from nvidia could replace the one i had, no problem. but it cant fit in my pcie slot. what do i need to do to solve my problem? am i going to have to buy a new motherboard or am i going to be cutting some plastic off my pcie slot?