The normal installation of MS SqlServer 2008 on Windows 8 will usually show you some compatability problems and result in an incomplete installation.
Use this method to resolve the problem
1. Open Control Pannel
2. Type and search for “Turn windows features on or off”
3. Now you will get a ‘Windows Features’ Window
4. Select .NET Framework 3.5(include .NET 2..0 and 3.0)
Make sure you select (tick) both the items under this.
5. Press OK. (Now it may take some time to complete)
Restart your system and install SQL Server. Avoid Any compatability issues warning and proceed to installation.
Refer the screeshots for clarity