Creating an instance of MS Project Application fails in VB .Net

[zuhrs]

In my VB .Net code, I am trying to create to launch MS Project Application.
Dim prjApp As Microsoft.Office.Interop.MSProject.Application = New Microsoft.Office.Interop.MSProject.Application

But I am getting the exception as follows:

"Creating an instance of the COM
component with CSSID {36D27C48-A1E8-11D3-BA55-00C04F72F325} from the
IClassFactory failed due to the following error: 80010001".

Note: This exception happens in 64 bit Windows 7 German OS. But the same code runs successfully in 32 bit Win XP (German and English) and 64 bit Windows 7 English OS.

I have even tried the following steps in German 64 bit Win 7
1. Running the application in Administrator mode
2. Setting UAC to low.
3. Re-installing MS Project in German 64 bit Win 7.

But still the problem occurs. Can some one please help me in resolving this issue.