Got several issues on my Dinc when I booted this morning. Here are all the symptoms I see:
1)None of my downloaded applications are recognized as installed-I only see the factory-installed apps in the app launcher
2)Settings->Accounts&Sync gets FC (com.htc.settings.accountsync)
3)Settings->Applications: While I do see all my downloaded apps in the list, the icons don't load for them, and when I click one, I get an FC on com.android.settings
4)Phone storage/SD Storage numbers look good
5)When I boot, the notification bar shows "Preparing phone storage", followed by "Preparing SD Storage" as it normally does, but the Sync icon only flashes for a second.
I'm running stock 2.1, no root...just a normal every day phone user. Was reading articles with the Time Magazine app prior to shutting down for the night. Had plenty of battery left, so I didn't even plug it in.
It seems as maybe you have downloaded a corrupt application or have a system settings error. The only fix currently is to perform a hard reset and wipe out all the settings. The steps for the hard reset are below:
Performing a factory reset via settings
Performing a factory reset using phone buttons
Once you have done this it should resolve your problems. Hope this helps