Just thought I'd share this information.
I've purchased a new machine with Windows 7. Everything was fine, including Internet Explorer (8) 64 bit, until I needed to access some web functions that seemed only to be available in the 32 bit version of Explorer.
Upon starting the 32 bit version of Explorer it seemed to run at a snails pace, which for the high spec machine I have is not right. It took approx. 30 seconds for the application to start compared with 2 seconds for the 64 bit.
I searched many posts and tried lots of the suggestions I found in order to correct this but nothing worked. I then shut down my Zone Alarm Anti Virus & Firewall and hey presto the 32 bit version was as quick as the 64 bit.
After some trial and error I managed to find the setting that was causing the slow running -
Open the Zone Alarm Control Center
On the left pane click Browser Security
Click Settings then Advanced tab
Under Virtualization remove the tick against Enable Virtualization
Retry 32bit Explorer
Hope that helps someone out!