I'm moving this to our Security forum. Please read the many "bridge.dll"-related threads in that forum- the error is the result of "spyware" on your system. You'll want to thoroughly check your machine for spyware, but to fix the bridge.dll error specifically:
Choose "run" under your Start menu and type "regedit" (omit the quotes) in the resulting dialog box; this will open the registry editor.
In the registry editor, navigate to HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Run. Right-click on the entry with the bridge.dll reference and choose "delete".
I have followed instructions,though find it not so easy.
When i go into the HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Run. I find another folder named 'optional components',then opens to find another three folders............IMAIL : MAPI :MSFS,there is no reference to the bridge.dll in any of them.
The rundll32 entry should be in the list of entries that appears in the right-hand pane of the Editor when you click on the the main HKEY_LOCAL_MACHINE/Software/Microsoft/Windows/CurrentVersion/Run folder in the left-hand pane. Ignore the "optional components" folders.