Problems calling my tv with Shell()

I have Video Wonder ProII tv card software, and It won't work when I try to start it from vb with the Shell() function, it says

Quote:

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Run-Time Error '5':
Invalid procedure call or argument

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good night :)

oh, yeah, here's my code:

Code:

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Private Sub Label1_Click()
Dim RetVal
RetVal = Shell("C:\VWPRO2\HDTV.EXE", 4)
End Sub

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Please don't let this go by without a post!

What happens if you type:
HDTV.EXE
from a DOS prompt in the
C:\VWPRO2\>
directory?

I got it to work! Thanx! :) :)