How will i prevent my PC from hanging up after using almost 24/7?

Unless the outside temperature is very high, a PC is designed to have sufficient cooling by one or two tiny fans that are put inside and which start running the moment PCs are switched on and they remain running until the PCs are switched off. So, there is no need for any special hardware or software. If you find that the outside temperature is very high and a PC is likely to be adversly affected, you can ask an extra fan to be installed inside the PC. It would not cost you more than, say $10. But make sure that the PC has adequate circulation of air around it and that it is not kept too close to any wall.

Why, do you really need your computer to work for you 24/7? I've read somewhere, sometime I just dont remember, computer designed for long continous hours of use. Something to do with a thermal cooling systen installed on it's casing.

If your Pc is properly vented and that. is to say, has a good air flow around it there should not be a problem. Mine has worked non stopp for 2-3 days at one sitting., on many occassions. I have Windows XP Professional from 2002 amd nary a problem. Once or twice a year I might have to do a system restore if Spyboat (FREE)does not catch something that might have given me a little bug or something. To me a radiator throws OFF heat no cool air. Anyway tthe built in cooling system is supposed to be sufficient. If it is not doing the job you should ask a technicien or your PC Nerd friend. I know when I ask my to do a simp;le thing .(something I think I better not try) it costs me money.