Firstly make sure that you have the "Linux Kernel source code" installed, if you did FULL install it will probably be there already.
Download the following file and save it to your home directory:
Unpack the archive from the command line:
tar -zxvf intel-537ep_secure-188.8.131.52.tgz
enter these commands
- You will be prompted for the root password
Assuming that everything suceeded, your modem should now be working for Mandrake 10.