Scandisk 1gb how do you download music to a sandisk from your pc tablet

There could be several issues here.

Is the computer showing the Sansa as plugged in?
Does Windows Media Player show the Sansa as plugged in, or does WMP say "Please Connect a Device"?

Are you running Windows Vista or windows Media Player 11? If so, grab the Firmware update from Sansa's website at: http://www.sandisk.com/Retail/DriverDownloads.aspx

If the player keeps freezing while plugged into the computer, you may need to Format the player in Windows Media Player 11 after performing the firmware upgrade. This will erase all of your songs off the player, so you will have to reload them. But your player will work fine after that.

Erases Everything: Connect your Sansa player to the computer and open Windows Media Player. Click on the Sync tab. Pull down the drop down menu underneath the Sync tab by moving your cursor over the Sync tab and left clicking on the little black arrow underneath the Sync tab. Highlight "Sansa 1GB" (wording may vary slightly), and then select "Format." - this should erase everything.

-Tha Mp3 Doctor