you will probably need to create the Sansa.fmt document and reflash the firmware. This will format your player and reload the the firmware and likely stop both the freezing AND load main image fail message.
You will need to boot the player into recovery mode. This can be done by engaging the hold switch then press and hold the record button and connect to the computer.
When you see Welcome to recovery mode on the screen of the player, you can let go of the Record button
Now open up the My Computer icon and open a icon that says 16MB format.
Once open, right-click anywhere in the blank spaces of that folder (anywhere but on the Version.txt document) and select New then select Text Document. Once done, open the newly created text document, go to file, then Save As.
For the Save As file type, change it to All Files. For the name type in: Sansa.fmt and click Save. Now close the text document. The Sansa.fmt should no longer have the standard notebook icon, but a generic windows icon.
Now go to forums.sandisk.com and select the E200 thread, then select the E200 V1 firmware (NOT V2) and download the firmware.
Once downloaded, extract the files and place them in the 16mb format icon along with the Sansa.fmt and the Version.txt document that should already be there. Once all that is done, disconnect the player and you should see "reading main image, writing main image ...." on the screen of the player. The firmware should now be re-flashed and you should be good to go. (take the hold switch off)