How do you start the computer from a previous date.

I overloaded my desktop and now the computer is frozen. It will turn on but none of the applictions work. I can pull up preferences. I would like to start my computer with a previous date when everything is working.  Please tell me how to do that. I know how to put it in safe boot.
Thanks,

To return your computer to a previous date you have to have been doing backups with the Application called TimeMachine.  It is turned off, by default.   TimeMachine automatically backs-up your user files to another disk or to rounter with a backup disk.  When TimeMachine is enabled, you can return to any time or date in the past by running the TimeMachine application and doing a Restore on the date and time you choose.
If you didn't have TimeMachine running or a current backup....
FYI:  Microsoft's Windows has a feature to restore it's Registry to a previous date, but that is not backup of the user files.   It allows the system to replace the Registry database back to a point where it was not corrupted. 
A similar fix for the Mac OS is to reboot the computer and hold down 4 keys to reset the PRAM (that is your system Preferences).  This is a very quick fix and it should be the first thing you try.   As the system is restarting, hold down the OPTION- COMMAND-P-R keys all that the same time.
Failing that, you can boot the system up in SAFE mode, which brings up the Mac OS without enabling any of the extensions.   It requires a wired USB keyboard and mouse - won't work with a wireless keyboard or mouse. Cycle power and hold down COMMAND-S keys on reboot.  This will allow you basic access to your system and you can reomove or delete any application that you suspect is causing a problem.
If none of your applications work on the Mac, you can boot up from the gray repair disk (or boot up Disk Warrior or Tech Tools).   All of them will clean up the file systems and that is usually all you need to fix things. Insert the disk. cycle the power button (hold it for 11 seconds) and hold Command Key+C (for CD) on your keyboard while it boots back up. 
The most common cause for persistient hangs is too little memory (RAM) or the harddisk is full.   The RAM problem can be minimized by not running other big applications.   If the harddisk is over 80% full, you will see significant slowing.  At 90-95% full, the system can barely run.   Run Disk Utitliy from the APPLICATIONS / UTLILITIES Folder, as The Hatter suggested (above).  Disk Repair is the option.
Note: If any recovery works with a wireless keyboard and mouse, I am not aware of that new functionality.   Also, any USB keyboard and mouse will work, even if it's from a PC.

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