Load_helper is part of the rommon code on the switch and is just part of the procedure to recover. XModem is available on most terminal emulators whether hyperterm. Tera Term or Putty . Follow the doc and you should be able to recover the switch.
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If you do load an IOS via the console port, you might want to push the console's fastest rate supported both by the 3750 and the host you're using. Also, use the "fastest" transfer protocol that your comm program and 3750 share, e.g. xmodem-1k (?). Lastly, you might want to load the smallest IOS image you can find, to get the device on-line, then flash it across the network with the intended IOS.
The load_helper command was used on certain platforms to load and initialize a boot helper IOS image. This image supposedly allowed you to access hardware, modules and line cards that the bootloader itself did not recognize. However, on most fixed-configuration switches like 2950/2960/3550/3560/3750, the load_helper command actually did nothing - there is no concept of a boot helper image on these platforms - and most recent bootloaders do not even contain this command.
So if it is not available, don't worry - it wasn't doing anything anyway.
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