Feature '75a0fea7-cd50-401e-af0e-782f3662a299' is not installed in this farm, and can not be added to this scope.

When I was trying to create Top-Level site using "Help Desk" template I got next error "Feature '75a0fea7-cd50-401e-af0e-782f3662a299' is not installed in this farm, and can not be added to this scope"

One of the ways to resolve this issue to install Windows SharePoint Services 3.0 Application Template: Application Template Core.

Install:

stsadm -o addsolution -filename path\mySolution.wsp

stsadm -o execadmsvcjobs

stsadm -o deploysolution -name mySolution.wsp -immediate -allowGacDeployment -force

Uninstall:

stsadm -o retractsolution -name mySolution.wsp -immediate

stsadm -o execadmsvcjobs

stsadm -o deletesolution -name mySolution.wsp -override

stsadm -o execadmsvcjobs