How to install Hyper-V on Windows Server 2008?
This is stable virtualization environment in 5 minutes.

Step 1. Take a look that Your processor support virtualization (models VT-x or AMD-V).
Step 2. System Windows Server 2008 must have version x64.
Step 3. Confirm that update ?Hyper-V Update for Windows Server 2008 x64 Edition KB950050??? is installed.
Step 4. Run ??oServer manager???, choose ??oRoles??? and click ??oAdd Role???.

Step 5. Set Hyper-V, click ??oNext??? and ??oInstall???.

The virtualization environment is ready to use. Access by Administration Tools -> Hyper-V Manager