Connecting/ sync. two computers

HI everybody and and thanks for replying

If my computer (quadcore, 8gb ram and windows 7 i 64 bit) could handle both Cubase 7 all my vst instruments and a
videotrack smooth everything seems to be okay !! But my problem is the Video it flickers sometimes. I seems like windows needs more RAM to handle both !?

Can someone tell me if this is my problem ? or does anybody have another solution ?
could I configure windows differently ? or cubase

Else here is my solotion so far :

On my computer no 2 I could install the videoprogram ChainGang ( Yes it´s the name ) and then connect them in (Midisync)