Ashtangakasha, Launch Windows store on your PC and search for My Dell. You will find the uninstall option in Windows app as well. Once done, restart and install it again.
I have the G7 7590 laptop... Recently the power manager required an update. .fine.. I updated it... now it tells me I have to use "My Dell" to control the power plans. Fine.. I opened My Dell and it kept giving me exception header errors. I've done a windows update, I've done every dell update for the laptop. I even uninstalled the My Dell app but when I go to install the app again, I get the dreaded  error from the microsoft store. I have since done a wsreset in powershell, I've done a dism cleanup image and sfc /scannow with it still giving the blasted error. I need to be able to easily switch thermal plans and with the dell power management app continuing to  [IMAGE]
0x800706d9 on MY Dell Install from store