As you have already been told, bridge.dll is spyware, you do not want to restore it.
http://www.2-spyware.com/file-bridge-dll.html
(Previously posted by Jeff4379) If you're using Norton WinDoctor:
To copy the file Gapi32.dll to where WinDoctor expects to find it
Open Windows Explorer.
Navigate to the folder C:\Program Files\Common Files\System\Mapi\1033\NT.
In the right Explorer pane, right-click on the file Gapi32.dll and choose
Copy.
Navigate to the folder C:\Windows\System32.
Right-click on the folder System32 and choose Paste.
Close Windows Explorer.
Restart the computer.
Now, when you run WinDoctor, the error should no longer appear.
or
Tell WinDoctor to ignore the error
Because this appears to be a problem with WinDoctor and not with the
Microsoft files mentioned, it is probably safe to set WinDoctor to ignore
the problems so that WinDoctor will not keep detecting them. To set
WinDoctor to ignore these problems, read the document Norton WinDoctor is
unable to repair an error or finds the same errors repeatedly.
Needed Windows XP system .dll files are usually protected, and will be automatically
replaced from the .dll cache if deleted by mistake. It's the dll files that have registry
strings left behind from unclean uninstalls of spyware/worms or bad uninstalls of
software, or in the Norton case mentioned above, where the software doesn't find the .dll
file where it's expected to be because of a bug in the install routine, which
Symantec/Norton is infamous for...