Here you go -

code:
IF KEYEXIST('HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{0EFC6259-3AD8-4CD2-BC57-D4937AF5CC0E}')
  RUN 'MsiExec.exe /qn /x{0EFC6259-3AD8-4CD2-BC57-D4937AF5CC0E}'
ENDIF
Note: the switches /qn /x

HTH,

Kent
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