ok so i get onto minecraft just fine, i have no mods installed aside from a latin language pack, i recently updated to 1.5 (which i know has some issues to iron out)
after about a minute of game-play the whole thing just stops, my mouse gets frozen and i'm just there looking at what i was doing, i control alt delete and it starts again for about a second, then goes totally unresponsive, i have the newest java installed and i have read all the other forum post with no success i have tried a fresh minecraft, force update and all that, nothing seems to work, PLEASE HELP!!!
Try going into the minecraft options and turn off smooth lighting and see if your gameplay is better. If so, your PC just can't handle the new version. Some of the new lighting calculations have reduced fps substantially. Many people report Optifine helps quite a bit.