grep-find does not run sometimes

[astast69]

Since grep-find command doesn't work on win mashines I use my own program. I
run (grep-find "myprogram searchString"). But in emacs 22.0.50.1, sometimes
nothing happends. No error, no action. Then i can try running the
interactive one (M-x grep find #strange unix-non-working-string#) which
"works" in the term that it give me a error message. After this, the
non-interactive one works (grep-find "myprogram searchString"). 
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