Hallo Johannes, You may find Superantispyware good for this as it has options to control Hi Jacking. Attachment 18545 SUPERAntiSpyware.com - Downloads
I myself would be wanting to know why it is happening?
All i can think of at the moment is possibly a MSN third party cookie (tracking cookie) is active.
A scan with Superantispyware will find any of those that are in your system, if i think of anything else i will post back
EDIT; actually i see you use Ccleaner that would have cleaned out any tracking cookies.
Check your Internet options to and delete MSN if it is there Attachment 18546