i have the amd r7 360 but i am getting low fps and i never did before need help

i install the r7 360 in my system and tested it the first day i got it getting 90-100 fps on no more room in hell then i had problems with my operating system (black screen after login on windows 8.1 after update fixed it) now im only getting 2-9 fps can someone help me

system specs
8gb of ram
500w psu
500gb hard-drive
r7 360 graphics card
78lmt usb3 motherboard
amd fx 6300
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