I want to download my pictures from my sanyo 770 digial to my p.c

It is not a solution to problem but it is an alternative way to get your photos. Most camera use HDSD/SD memory card. If you buy a USB card reader that can take HDSD/SD card, you can just

1. take the memory card out from your camera
2. insert the card into the card reader
3. turn on you PC
4. plug your card reader into a USB port on your PC
5. your PC should give you a few more additional drives
6. your photos are in one of those new drives
   

2 Options:

1. Your camera probably came with a USB cable. If so you need to connect that cable from your camera to your PC and turn on the camera. Your computer should automatically recognize that you've plugged it in and should run a "wizard" that will walk you through importing those photos.

2. Your PC may have a "multi-card reader" this is a series of slots that accept different sizes/types of memory cards from cameras etc. Your camera has a memory card that you can remove and place into one of these slots. Again once you've plugged in this memory card you should again get the wizard asking you'd like to do.