Hey manually update to the latest version of chipset and Bios version from dell's site and then follow this steps(as mentioned in here by Martin) but don't uninstall supportassist just clean files and download free version of Revo uninstaller to do 'advanced' clean uninstall of support assist through hunter mode. Restart pc and again install it through dells site...this perfectly worked for me.
Yesterday night, I launched Dell's Support Assist to do routine maintenance tasks such as clean up, optimizing performance etc. But as I launched the application it showed me a dialog box saying "A new version of SupportAssist is available and is being installed on this PC. Depending on the speed of your PC, this update can take several minutes." Another dialog box launched in addition to the previous dialog box that read "Getting application files". I have waited the whole day for the upgrading process to complete but it hasn't, it looks like it is stuck. So kindly help me out. [IMAGE]Dialog Box 1   [IMAGE]Dialog Box 2. The loading status is in motion but never moved to the completion stage.  
Dell 5567 [Support Assist is not updating and stuck]