My Norton Internet Security (registered (1 feb 2013) wont do any scans

when i open norton internet security I cannot acces the settings page. also when i access the scan now page the only thing that opens is the custom scan section. the other two will not open. even when i use the custom scan page nothing happens.

 

please help, it was working fine before, i accidently downloaded yontoo and then ive been having problems

 

thank you

 

:smileyfrustrated: