Video preview in Edit runs at double speed, audio runs at normal speed.
A: Computers with an AMD Athlon™ 64 X2 Dual Core Processor will sometimes exhibit this behavior. The fix is supplied by AMD in the form of a driver located here:
http://www.amd.com/us-en/Processors/TechnicalResources/0,,30_182_871_13118,00.html
It will be listed as “AMD Athlon™ 64 X2 Dual Core Processor Driver”.