Win 10 64 bit (1703) boot time too long!

OK, I'll report back.
Thanks again for all your help.
Ed

Zinou,
I installed a newer video driver.
I uninstalled Avira.
I ran that xbootmgr thingy but I have no idea if it was successful. I left it alone for a few hours but I have no way of verifying if it did anything.
My boot time is now a little under 3 minutes. Better than before but still not overwhelming.
I'm ready to throw the towel.
Ed

if you see this file "BootPrep_Base+CSWITCH_"etl" under your profile "C:\Users\yourprofile", that means xbootmgr has succefuly finished.

No.
In fact, I don't see any of those boot... files.
The only file is the NTUSER.DAT file.
Ed