I have an error when compiling a simple form project...

I just start a new Form project and add a new PictureBox in a form(or
anything that generate the .resx file)

After that when compiling I always get the following error (in VS
2005):

Compiling...
blablabla.cpp
Compiling managed resources...
Unhandled Exception: System.IO.FileLoadException: Could not load file
or assembly 'ResGen, Version=2.0.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. Strong
name validation failed. (Exception from HRESULT: 0x8013141A)
File name: 'ResGen, Version=2.0.0.0, Culture=neutral,
PublicKeyToken=b03f5f7f11d50a3a' --->
System.Security.SecurityException: Strong name validation failed.
(Exception from HRESULT: 0x8013141A)
The Zone of the assembly that failed was:
MyComputer
Project : error PRJ0002 : Error result -532459699 returned from 'C:
\Program Files\Microsoft Visual Studio 8\SDK\v2.0\bin\resgen.exe'.

Note: I get the same msg just be running resgen.exe without any
parameters...what is wrong with my installation?????????

Thanks!