First make sure that your Sansa is set to USB Mode or it won't connect to your system at all. If you're not sure how to set it to USB Mode, consult your manual or visit the Sandisk site I've added to this answer. It should be in your Settings menu found in your Main Menu (Main Menu - Settings - USB Mode) or something similar.
Also make sure that you're using the correct Mini-USB cable to connect your Sansa to your computer - not all cables are the same, as some devices won't accept voltage from just any cable. In some cases you have to use the cable that came with the device itself.
You also need to make sure that the device has been recognized by the computer - any device connected via USB or Mini-B cable will be detected by the computer if connected properly. If it's not recognized, then the connection isn't being made. Open your system's "My Computer" window to see if your Sansa is listed as a separate drive (MP3 players will be seen as an extra drive because of the memory in the disk). Also, make sure that you have a Sandisk card installed if it's a removable type or it won't be recognized.
Another thing to try first is to just restart your computer. After it's restarted, retry the connection again. If it fails to connect, try it on another system if you have access to one to make sure it's not the computer itself. If it fails to connect on more than one system, then it's likely a cable or battery problem, but most likely the battery.
You need to intall the software first
Copy and paste from PC to the Sansa
SanDisk Clip Sport
The SanDisk Sansa Fuze can play MPEG-4 video.
A Sansa mp3 player is a product of SanDisk. This is a fairly common product and could be found at many major retailors, online stores, or directly from SanDisk.
You can't you simply can't. The product was so poorly made for malfunctions that there is no restoring what once was.
http://go.shopsansa.com/content/OtherAccessories
Just connect your player to your computer and view your players files from Windows Explorer and delete the unwanted files.
Sandisk have a range of MP3 players including the Sansa Fuze+ which have a capacity of 4GB, 8GB and 16GB. Sandisk's other MP3 players such as the Sansa Clip Zip and the Sansa Clip+ only go up to 8GB.
You can read reviews about a Sansa mp3 player on the following site:http://reviews.cnet.com/mp3-players/sandisk-sansa-e270-6gb/4505-6490_7-31684140.html. They have good reviews.
To load audiobooks onto your SanDisk Sansa View, connect the device to your computer using a USB cable. Then, simply drag and drop the audiobook files from your computer to the appropriate folder on your Sansa View. Alternatively, you can use software like Windows Media Player or iTunes to sync audiobooks to your device.
itunes only supports ipod not sansa