IE 8 doesn't close with Norton toolbar

Hi,

my problem is that i can't close Internet explorer 8; i can cloise the window but the process still running in the system.

I tried to turn-off all add-ons and it close properly, so i turn-on one add-on per time and i discovered that the Norton toolbar causes the problem.

Anyone else has this issue?

 

My system:

Windows 7 64 bit

Internet exploer 8

Norton Internet security 2011 v. 18.5.0.125

 

Thanks.