Boot manager at start up with only one OS

Nobody who has ever followed closely Clean Reinstall Windows 7
has ever reported issues like yours at all, or any other issues except a perfectly running install.

But it's obvious you don't want to try those steps or you wouldn't have installed Norton AntiVirus which is bloatware that causes many problems we see here.

I've already given you my suggestions which still stand. If you get the chance I do hope you will try deleting all partitions to follow exactly the steps for a Clean Reinstall Windows 7 to see if it works for you like it has for a million others, or if you are the only one for whom it doesn't.

I had follow closely in the steps windows 7 clean install, even when I do know how to do the clean install methods. When it comes to clean install I am no newbie, in fact I still do clean install on w95 98 for people who love and still use the w9x.
I had installed windows 8 then upgrade to 8.1, no issues with windows 8 now after resolving the updates technical issues.
Today I install windows 7 in my son vaio same model as mine, and to my surprise there are no technical problems, everything
is running great. The only thing that comes to mind in terms of hardware is the CPU could be overheating just a little bit.
I have to disassemble the unit and check the cpu thermal paste. Thank you everyone for all the technical advice.

God Bless everyone and a Merry Christmas to all:)

You don't need to disassemble your laptop to check if it's overheating, just follow the step for determining and dealing with this in Troubleshooting Steps for Windows 7