Error Code: 0xe0434f4d

[jonc1]

I have written a windows forms app, for .net 3.5 sp1, I have dployed this OK to a Vista machine but it fails to run on an XP machine. It generates the above execption code.

I initially thought this was a .NET security issue but the app was installed from the local physical disk and is a fully trusted app.

Anyone any ideas ? (I have deployed other apps to both Vista and XP before using the same security??)

[Plater]

Does the XP machine have the correct version of .NET installed?
Are you using any third party DLLs or COM objects in your project?

[jonc1]

It had 35 on it so I have now created a fresh XP install (in a VM) with 35 SP1 on it. Now the prog starts for a second or two and dies without any messages. I checked by running filemon and it did start but very brioefly. No window ever appears.
I am not referencing any third party dlls or com objects.
is there some compatability issue here or am I right to expect this to work ??

[jonc1]

New development, I have now installed VisualN Studio onto the oroginal XP machine. The prog now starts! This happens both if I run it from within the IDE and if I use the copy I had already installed on the OS.

There must be something that VS installs on the OS that I am depending on but I have no idea what !

[Plater]

Are you using anything in the VisualBasic namespace? Becuase that requires a special runtime.
Otherwise I am not sure why installing VS would help, unless it installed an older version of .net (1.1 or 2.0 or 3.0) that maybe is just expected to be there