In the last five days I am having a problem with my computer. Suddenly it became very slow. I can't work with it usually. Even the mouse cursors run very slow. Start menu doesn't work.
But when I scan virus with Norton 2010 antivirus it can't find any viruses!
Then what is my problem?
hi friend,
first of all we need  to identify what is happening on your system. if you are a computer expert i can explain advance techniques. but i will mention simple method ( if you want more just post me a reply )Â
open task manager ( right click on taskbar and select start task manager , or press Ctrl+Alt+Delete ) and go to processes tab and please identify what are the current processes which are consuming your memory and processor usage
you can find the name of the process if it is displayed.
if there is any process which consuming your memory and processor right click on it and select end process tree. ( it will end up all the activities and sub activities related to the process ) then try whether your machine is working fine.
or if you can find anything which consuming most of your RAM and processor in high level you can use a malware scanning tool to scan your computer ( let me tell you that no virus guard in this world will able to detect 100% viruses )
download malwarebyte or Spybot malware tools ( all are free versions ) and scan your computer and check whether it has detect any malware
malwarebyte download link   Download Link1
Spybot download link            Download Link2
before this happen, did you install anything or did you do any modification to your system. it can also cause this problem
