Once computer dies, when starting back up get "eratic" application message

1st my battery has not been holding a charge for long at all. I charge it and it says that it is charged then I unplug it and it only last like maybe a hour. It used to last like 2 hours. It doesn't charge long either.
Once is does die when I leave it on unplugged and I come back to use it I have to restart it totally. I used to be able to just move the mouse or hit the space bar and it would wake up and I could plug it in.
When it does restart I get a message that says "Your computer's clock is set to a date before March 24th, 2001. This may cause some applications to behave erratically." Then it says someting about going to the Time and Date preference panel to change it. The funny thing is that once I click OK it doesn't do anything to the time and date. but several applications like iChat & Safari have been acting "erracically." Like iChat will start up in random places on my screen & i have to restart safari windows to get them to load.
I got the Mac only a year ago so I don't know what is going on.
Please if you have any ideas write me back, this comp. is my life since I am a graphic design major about to graduate. Thanks so much!
iBook G4   Mac OS X (10.4.9)   HELP!!!

AppleSyncNotifier.exe - unable to locate component. This application has failed to start because CoreFoundation.dll was not found. Re-installing the application may fix the problem.
Do you have the MobileMe control panel for Windows, lizzie? If so, try uninstalling and reinstalling the MobileMe control panel. Does that clear up the message?

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