1. Try disabling cpu frequency downclocking (some report that the cool'n'quiet stuff can cause issues when it transitions cpu clock speed. Power options, set to "performance" should do the trick.)
2. Maybe try this app to see if you have general latency issues caused by a dodgy driver.
"Thesycon’s DPC Latency Checker is a Windows tool that analyses the capabilities of a computer system to handle real-time data streams properly. It may help to find the cause for interruptions in real-time audio and video streams, also known as drop-outs. The program supports Windows 7, Windows 7 x64, Windows Vista, Windows Vista x64, Windows Server 2003, Windows Server 2003 x64, Windows XP, Windows XP x64, Windows 2000."