Radi, its time to create a little mandatory infos to post looks like:
OS: Windows 7 or 8 or 8.1
Video Card: ATI XXXX, XXXX NVIDIA or INTEL XXXX
Memory: 4, 8, 16 GB
Monitor Resolution: 1280x720, 1366x768, 1440x900, 1680x1050,1920x1080, 1920x1200???
Video Editor: Vegas 11, 12, 13? Adobe CS5, CS6, CC? Power Director 11, 12??
Game Problem: COD 4? DUST? BATTLEFIELD 2, 3, XE??
Video Type: AVI or MP4?
Before posting install all current drivers, it serves mainly to AUDIO and WEBCAM. Please, not use deafult drivers by OS, its no have hardware acceleration.
That would be the minimum to be able to help.
If no have correct infos is difficult to answer.