Can't use Norton after Adware found

Hi,

 

I have recently installed Norton Internet Security for Mac on my OSX Lion Mac.  I have done two full scans and each time it has found some adware...I click delete and then it says its been deleted but all the buttons go grey and I cant operate or close the application any more.  

 

I have seen that there was a post about this over a year ago and it was mentioned that this was a bug that was to be fixed in future releases. 

 

It can't be that this bug still exists a year later?  Please advise on how this can be resolved.

 

Many thanks.