Yes, I had tried all that. Changing the user will start the HWiNFO task when you login with the following error:
"Cannot install HWiNFO driver! Check user rights and anti-virus filters"
This is the same error you get when you double-click HWiNFO in standard user account without "run as admin"
The Task scheduler trick works only for Administrator accounts. If you log in to admin account, yes, there are no issues. It doesn't work for standard user logins. At least, it never worked for me and after much trial and error, I have done what I mentioned above.
I never use the admin account and always use the standard account for my day to day activities. Adding HWiNFO to my startup will always ask for admin password since it requires elevated privileges. I wanted to bypass the UAC prompt and spent some time on this topic. Its very difficult...