1. Check that your system BIOS is at the latest revision as listed on the Dell support web site. Update if necessary and reattempt the install. 2. If the install still fails, you may need to do a complete removal and reinstallation of all Support Assist components. Check this post from Dell support for instructions on how to do this.
SupportAssist Installation failed, what can I do?
"DS: SupportAssist Installation failed, what can I do?"