Program Backup Software

hello fellow nairalanders, please can anyone tell me how to get a Program backup software( a software that can recover applications/programm if system shuts down unexpectedly may be power failure or any other reason. What i mean is a software that can recover my application e.g internet explorer, mozila etc. when my system shuts down unexpectedly. for better understanding, may be i am on a yahoo web page and there was a power failure and when i immediately turn on my system i can still have access to that yahoo web page that i was browsing on before the power failure.