Follow along with the video below to see how to install our site as a web app on your home screen.
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Does not sound good. If you cant get the widgets to work again, you may have to re-install them. similar with your apps. You can re-create the icons by dragging the app u want from the app drawer back to the desktop.
Also programs like Launcher Pro and ADW have options to backup your desktop so you can restore it easily in such situations. You should also use something like Titanium backup to backup all your apps and data.
Every now and then backup the sdcard\TitaniumBackup folder to your PC or a flash drive just in case your microsd goes belly up.
If all else fails, do a factory reset (Hold power,home(or was it menu) & big button on front wihlst booting), format your external microsd for a really fresh start and start again. Note: You will lose all of your apps, settings and data.