Determine if .net 2.0 framework service packs are installed.

To determine if a service pack is installed on a specific framework version :
- open the registry editor(regedit)
(All versions are listed to the path HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\)
- Look at HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\vX.X.XXXXX
(Where the X means the version to check
- Look at the key SP, the value is the service pack installed

In exemple, for the framework 2.0 
Path : HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v2.0.50727
Key SP value : 1

This information means the Framework 2.0 sp1 is installed