Well, since you've got the only copy of that file (msrxomhl.exe) on the entire web (lol)
... you've either misspelled the name, or got a neat virus (which isn't there any more, if you can't find the file, so don't panic

). Disable it by running
msconfig (Startup tab) from the Start Menu, Run... Or delete it from the Registry; should be under teh key @
Code:
HKEY_USERS\..\Software\Microsoft\Windows\CurrentVersion\Run