So, you have your BHO ready for debugging and it’s just don’t work as you wish in IE8. This issue happens after MS introduced LCIE – (Loosely-Coupled Internet Explorer) in IE8. More information about LCIE can be found @ This following will guide you through the steps of overcoming the issue: 1. Run regedit 2. Browse to HKLM\SOFTWARE\Microsoft\Internet Explorer\Main 3. Add a new DWORD called TabProcGrowth 4. Set its value to 0 That’s all.