MPC "laggs"

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Problems started a week ago. But first my pc specs:

i7 4970K
Gigabyte Z97 Gaming 5
(EVGA GTX 980 SC AC 2.0+ whatever)
SSD and HDD

Since years I used the K-Lite Codec Pack. For me it was the simpliest way to watch videos (90% animes) in a good quality with more or less current codecs. Half a year ago I got into this 60fps shit. Tried the smooth video project - worked perfectly on me. Combined K-Lite and SVP because the subtitle codecs from SVPs own player were so fucked up that I have to use more or less recent codecs from K-Lite but also want those magic 60fps. It worked perfectly (well the mpc became a bit unstable, sometimes crashed if I jumped to different timesteps in the video).

tl;dr: 60fps fag combined svp with klite and it worked.

A week ago my buddy fucked his gpu up and had have to order a new one but own an old i7 processor without a "small graphic chip" like my cpu. So I borrowed him by gpu until his new one arrives. The problems started.
1 or 2 days after the gpu transfer I recognized some strange things while watching my anime. All 4 or 5 secconds a little lag occured. Just a splitseccond but noticeable because of the fluent 60fps video. I was very confused because laggs are things which I never had have to deal with. Checked the cpu workload - no problem at all. Shutdown pc, wait a couple of minutes and boot it again. Even more noticable laggs!
>WTF?!
Completely uninstalled SVP and the K-Lite, clean the registry with ccleaner and reset everything. Opened the episode in Windows Media Player - laggs! Really pissed on and installed fucking vlc. No laggs.
>Tilted.
Wiped the entire pc, reinstall fresh Win8.1. Installed all those drivers, can play LoL without problems so everything seems to work. After this I installed SVP and K-Lite - it works. No laggs, only fluent 60fps anime.
But magically after one day the shit returns like in a bad movie. Started a show, laggs, deactivated svp - laggs, windows player -laggs. vlc - trololol no lags.

>cont.