choppy video windows 7

May 16, 2018
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i just got a new pc:

c drive - 1tb
l drive - 2 tb
ssd drive 256 gb
Intel Core i5 - 3.1GHz TURBO
ram 16 gb
nvidia geforce gtx 550ti

im getting choppy playback online, offline. same choppy WinMed player and gom player.
what can i do?