Don't use the 64-bit version, it's not as refined as the 32-bit version.
To remove stutters, get reclock. the default settings should work ok.
Get madVR if you want the best PQ possible. Once you install madVR, you should be able to select it as a renderer in the output section of MPC HC. To configure it, there should be a tray icon. If not, right click MPC HC while a video is playing, go to filters and click on madVR. Also, you must keep the madVR folder in the same location it was installed.
You may have to tweak the scaling options to work smoothly on your machine. For scalers, generally you want a softer chroma upsampler and a sharper luma upsampler, but it's all personal preference. Sharper algorithms usually put more processing load on the GPU.
Keep in mind that when you view a movie in windowed mode, madVR uses considerably more CPU power. Fullscreen (aka Exclusive mode) uses less CPU power, so if you experience choppy playback in windowed mode, try fullscreen. I'm sure you watch movies in fullscreen anyway.
If you can't get madVR to work smoothly, then try ffdshow decoder and use EVR CP renderer.
Once ffdshow is installed, go to output and deselect all colorspaces except RGB32. Then go to RGB conversion and select "High Quality YV12 to RGB conversion" and also check "Dithering".
In MPC, go to external filters, add ffdshow video decoder (not DXVA) and set it to prefer.
If even ffdshow runs choppy on your machine, then just use EVR CP with MPC's internal DXVA decoder. Try enabling Full Floating Point Processing or Half Floating Point Processing by right clicking MPC HC, selecting renderer settings and then Presentation. If those make videos too choppy, enable 10-bit output; this will at least give you dithering to avoid banding. Also enable the YV12 Chroma upsampling shader. Right click MPC, select Shaders, pre-resize pixel shaders, then YV12 Chroma upsampling.
LAV splitter is also something you might want to get. It's the best media splitter out there. To use it, you have to uncheck the internal splitters (Matroska, MPEG/PS/TS, MP4, or whatever other containers that you have).
madVR
LAV Splitter
ReClock
ffdshow
MPC HC (that's where I get MPC HC from)