Troubleshoot:Computer slow after upgrading to Windows 8.1 Error

Computer slow after upgrading to Windows 8.1

Original title: Windows 8.1
Operating system - Windows 8.1 single language 64-bit (6.3,build 9600)
System manufacturer - Lenovo 
Processor - Intel(R) core(TM) i5 4200M cpu @2.50 GHz (4CPUs),  ~2.5GHz
memory - 4096MB RAM
Page File - 2016 MB used , 5799MB available 
directx version - dx11
Graphic - Nvidia geforce gt740m

    Conputer - Lenovo Z510


recently upgraded to windows 8.1.......
not happy .
You wouldn't believe that my older computer with intel core 2 duo processor is 10 times faster than this pc!

it takes around 3-4 minutes to start , then i enter the password and then again for 3.-4 minutes for it to be responsive . 
shutdown is slow too.
 It has also started to lag a lot.

windows 8 was much better - quick, fast, smooth.
(FYI - i have upgraded the drivers yesterday only)

What to do ?
 
Thank you.

Keys to the Problem Computer slow after upgrading to Windows 8.1

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If you failed to fix it, another option is to call Microsoft and walk through the process with a technician. To do this, dial "1-800-936-5700". Explain the error that you received and the steps in the update process during which it was displayed. The technician will be able to walk through the steps from getting a new product key to finishing the installation.

Recommended Method to Repair the Problem: Computer slow after upgrading to Windows 8.1:

How to Fix Computer slow after upgrading to Windows 8.1 with SmartPCFixer?

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