windows 7 - Netbook not working properly

I am having a netbook of dell inspiron mini with specifications-

• Operating System: Windows 7 Starter 32-bit (6.1, Build 7601) Service Pack 1
  System Model: Inspiron 1018



• Processor: Intel(R) Atom(TM) CPU N455 @ 1.66GHz (2 CPUs), ~1.7GHz
  Memory: 2048MB RAM
  Available OS Memory: 2038MB RAM
  Page File: 1921MB used, 2153MB available
  Windows Dir: C:\Windows
  DirectX Version: DirectX 11
  DX Setup Parameters: Not found

Now the problem is that my netbook was working fine until i opened it after 3-4 days. My PC became very slow and if i wanted to open a folder or a file it didn't open and if i restarted or tried to shutdown the pc it didn't gave any response .
I TRIED

1. Running a Full and Smart scan in avast and a bitdefender quickscan;result was nothing.
   2.Tried to Boost my PC by clean master,ccleaner.
   3.Ran scan of malwarebytes-antimalware; result was nothing.