metalwork, if you want to try to fix it manually, open regedit and take a look at
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\URL\DefaultPrefix
and
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\URL\Prefixes

The ordinary prefixes should look like
www : http://
ftp : ftp://

etc. The default prefix should be http://
You may found the redirector there…