If virus was infection on our PC/Laptop then it gives a some symptoms.
these are :-
-Task Manager is not allowed
-Run and Search Button was not in your Start Button
and such as this symptoms
How to enable our Task manager And Run & search button
go to run and type gpedit.msc
choose user configuration tab
-click Administrative Templates
-click System folder
-click "Atl+ctrl+Del" folder
-click "remove Task Manager"
-and choose "not configured"
-and click okey
-if you you want to enable Run & Search button on Start then follow same instruction one is change
-choose Desktop folder the from of "system Folder".
Thank you !!