Why does my vista have the 32 bit iexplorer set as the default browser, ie. when I click the internet icon it launches 32 bit iexplorer, I can force 64 bit by clicking on the 64 bit iexplorer shortcut in start menu, but every time I click a link wherever, for example in msn, it launches 32 bit iexplorer, in the default app list there is no selection wich version of iexplorer to launch, so how can I fix this ?