registry editor and task manager has been disabled in my computer because of some virus activity.plz anybody help me to make them enable.

Okay first i recommend this: http://malwarebytes.org/
Download the free version then run it, update it then scan remove all bugs still their.

Fix task manager: http://www.taskmanagerfix.com/dl/download.php?id=1
Download it run it and hit fix task manager and done.

RegEdit fix: Open blank notepad and copy and paste this code in it:

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Applets\Regedit]

"View"=-
"FindFlags"=-
"LastKey"=-
Save on desktop name as restoreregistry.reg
then run click yes then restart then they should be fixed
GoodLuck