Syntax:
1) msiexec /x {PRODUCT_ID}
2) msiexec.exe /i { PRODUCT_ID } /qn REMOVE=ALL
1) msiexec /x {PRODUCT_ID}
2) msiexec.exe /i { PRODUCT_ID } /qn REMOVE=ALL
This blog will provide you with Installshield code and help which are the result of a long term experience.