Browser Help Objects (BHO), most of the time, are created for use with Internet Explorer, and Internet Explorer alone. They don’t serve any real function when loaded with a regular explorer window, so it can be useful (for memory reasons and the like) to enable Browser Help Object removal from the Internet Explorer.exe instance. You really don’t need them starting up every time you browse to a folder, or view your Control Panel.
Open Regedit (Start->Run REGEDIT) and browse to the following key:
HKEY_LOCAL_MACHINE SOFTWARE Microsoft Windows CurrentVersion Explorer Browser Helper Objects
You’ll see some sub-keys in that particular key in GUID format. The number depends on the number of BHOs you have installed.
For each BHO that you don’t want to load with explorer.exe select it’s GUID and add a REG_DWORD item named NoExplorer with the value set to 1.