We have an odd problem that I am stumped on. We just purchased two Dell Vostro 3700 laptops, they came with Windows 7 Pro installed. We have installed Windows Server 2008 R2 on each of the laptops which all works great until we enable Hyper-V. When we do this the sound will stop working correctly and becomes crackly and unusable. If Hyper-V is removed the sound returns. We are at a loss of how to fix this issue.