Hello.
I updated the version of my BitDefender Internet Security from 2011 to 2012 and found a serious problem,
rather than just performance or stability problem most of you may have felt so far.
Simply speaking, my web browsers( e.g. Internet Explorer, Firefox, Chrome ) do not display some websites properly containing Japanese characters called Shift-JIS, while Unicode ones appears to be ok.
Please refer following screenshot I took the situation for instance:
https://picasaweb.google.com/lh/photo/V9eDd...feat=directlink
I think this likely to happen because of some kind of programs' faults since version 2012.
There wouldn't be other considerable reasons as I haven't changed my system recently.
Changing some settings likely to relate didn't affect at all. 
Maybe... does this mean I should get back to previous version?
Well, I understand BitDefender programs are optimized for English Operating system so it's hard to specify this problem,
but I wonder if this could be fixed someday. Thanks in advance.
Finally let me apologize for my poor English .
Here are main specs of my computer.
OS: Windows 7 64bit
CPU: Core i7 2600K
RAM: 4GB
GPU: Radeon HD 5770