Computer wont boot properly after graphics install.

I recently upgraded from an anti radeon HD 5450 to the 7750 and the computer won't boot to the desktop. It instead boots to a screen saying boot normal or repair system (not sure on actual choice). I pulled the card out and it boots fine with the 5450 I've already updated my PSU to 500 watt power supply and am looking to get the card in soon.
 
Solution
Boot with the old card in and UNINSTALL the drivers. Then install the new card and install the new drivers. Do NOT let windows install anything automatically after bootup.


Currently when attempting to boot the computer it wont enter safe mode, only giving me the normal startup (Which dumps the cache) or the system repair. Should I boot with the old card in and install the divers then, once they are done replace the cards? Or am I missing some option to get the drivers with the new card in place.
 




It goes to a blue screen and dumps the cache. That I know whats happening which then reboots into the same screen into a loop until I shut down the computer.
 


When I do so that causes the loop of dumps, im looking for the 7750 drivers with the 5450 in but the instal disk is saying check their website for "Optimized Drivers" which has no signs of drivers anywere.
 


The problem is that the computer wont boot with the new card in it, I also cant get the new drivers because it keeps installing the 5450 drivers because its still in there. So im stuck at No card-> no drivers -> no card and so on.