For me, RIMWebComponents.cab is located here: Program Files\Research In Motion\BlackBerry Administration Service\JBoss\ejb\server\default\tmp\deploy\tmp959 1basClientWebDesktop-exp.war
A cab file is an archive, you can open it in winzip. Inside the cab file are RIMWebComponents.inf and RIMWebComponents.msi. The msi can be distributed using GPO, SMS, or other means.
If the cab file is not present, you have a different issue. I would check your rights, make sure everything is installing correctly. If that still doesn't work, try it on another box just to see if it is successful.
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