Changing the Path (environment variable) under VISTA with VB

[Popol]

Hi, i need to change the "PATH" environment variable in a VB program (Visual Studio 2008). Here is the code i use to add the "C:\TEST\" folder at the end of the existing one.

Dim PathVal As String
 
PathVal = Environment.GetEnvironmentVariable("Path", EnvironmentVariableTarget.User)
Environment.SetEnvironmentVariable("Path", PathVal & ";C:\TEST\", EnvironmentVariableTarget.User)

It work great under Windows XP but under Vista it did'nt work at all (even when running as a administrator).

How can i change the "PATH" under Vista?

Thanks in advance...