SSD and Problems with Start Button

I installed a new Samsung 850 EVO 500 GB SSD and just copied the info from
my 1 TB HDD to it with the included software.
Only had around 200Gb to transfer and I believe the process automatically
didn't copy some files like that in Virtual Memory , etc. Took around 45
min.
I did do a cleanup and defrag BEFORE I installed the SSD.
After I did the copy, I shut down and disconnected my HDD and it booted
right up from the SSD which is connected to a SATA 2 port, just like it was
when I did the transfer.
Bootup time is dramatically decreased. I was impressed.
But, in the last few days, sometimes the Start button will not work (left or
rt click) nor the search magnifying glass. If I reboot, sometimes it starts
working again. If I then try a total shutdown, it seems to work.
I did the upgrade from Windows 7 HE 64 bit to Windows 10 64 bit and it went
well. I did this last year.
Any ideas?
Is something getting bypassed due to the increased speed of the bootup?
Is this a fairly common problem when switching to a SSD?

Perhaps I should just erase the SSD and do a fresh install of Windows 10
from an ISO obtained online. Will MS recognize my new Windonw 10 install ?
What will I need to have to ensure that MS will recognize it? Remember, I
did an upgrade over the Win 7 OS.
Any hints on making it simpler and easier and faster?
Thanks,
Buffalo