OS X :: How To Run Rewind 24hrs

I have an iMac Intel Core 2 Duo (24inch). on 10.4.11 Is there anyway of going back to how it was running 24hrs ago? Then everything was fine (as always) but i decided to hook up my unlocked 1st gen iphone to OS3. Last night the imac seemed fine and this morning all seemed well. I came home from work and tonight and it seemed to be lagging slow so i though i'd do a restart. It wouldn't do it so I turned it off via the on/off button. On restart it went straight to iphoto which gave a command to update iphoto to make the thumpnails of better quality. I asked i not to bother just now, but on looking at iphoto i noticed that none of my photos were present. I tried to shut iphoto down, it wouldn't. I tried to open safari anf after some time it fired up only to shut down unexpectidly. Now all apps hang. It seem that i've lost all my photos somewhere and possibly all my music. I can only think this is associated with the iphone update last night. Is there any way of goping back 24 hrs or can u offer any other assistance please. It may only be an apple thing as firefox is responsive