Solution 1:

The inbuilt FTP tool should allow you to download Firefox, as detailed here

  • Type FTP 63.245.208.138 into Run or cmd.
  • When prompted for username, type anonymous.
  • Enter your e-mail address as a password.
  • Type hash and hit return.
  • cd /pub/mozilla.org/firefox/releases/3.0/win32/en-US/
  • type BINARY and hit return.
  • lcd c:\ to change the local directory.
  • type mget *.exe
  • when that's done, type exit, and go to C:, where your new Firefox installer should be.

Solution 2:

Search for iexplore.exe.

If you can find it, your problem is solved.