Stephen, reading the manual to get the proper commands and syntax would help you greatly.

code:
IF NOT EXIST ("C:\PROGRA~1\ADOBE\ACROBA~1.0\Reader\AcroRd32.exe")
	  RUN "P:\ADOBE\ADOBE.EXE"
ELSE
	RUN "C:\PROGRA~1\ADOBE\ACROBA~1.0\Reader\AcroRd32.exe"
Endif
or
code:
IF EXIST ("C:\PROGRA~1\ADOBE\ACROBA~1.0\Reader\AcroRd32.exe") = 0
	  RUN "P:\ADOBE\ADOBE.EXE"
ELSE
	RUN "C:\PROGRA~1\ADOBE\ACROBA~1.0\Reader\AcroRd32.exe"
Endif
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