When a dual core computer is used there shouldn't be any sync issues unless the computer has all audio recording options disabled and one has to use the Universal Audio Driver.

If you have audio/video sync issues, please specify what audio option you're using for recording and what is the computer configuration (single core, dual core, CPU speed). Sync issues can occur if the computer doesn't have enough CPU power to play full screen windows with a CPU loading less than 70%.

Press CTRL+ALT+DEL and see what applications use your CPU the most. You can try to disable "Windows Media Player Network Sharing Service" if you don't use it, because it can use lots of system resources.

WM Capture provides 3 options for recording audio:

• On Windows 7 and Vista the audio loopback is automatically setup. It fails (no audio is recorded) if the computer audio is set on surround sound and/or sample rates higher than 48000 Hz in the Playback Devices or the audio recording is disabled in the Recording Devices dialog. No sync issues.
• On Windows XP with Stereo Mix the audio loopback is manually set in WMCapture Audio Setup dialog or using the computer audio settings. It fails (no audio recorded) same as above. Possible sync issues on single core computers, or when full screen Flash or Silverlight videos are recorded (the video player loads up the CPU over 70%).
• On Windows XP with no Stereo Mix the audio loopback is set using the Universal Audio Driver. Sync issues are likely to occur.