A mainboard operating at 62
Celcius? Are you absolutely sure that's the board and not the CPU? I can see an Athlon 2400+ running at 62 C. You'd probably need an 'overclockers' cooling system to keep it much below 60, I'm sure. But the MB at 62 C is a shocker if that's true. I'd be afraid your CPU is running at 80 C or more and is in danger.
Cooling can be accomplished many ways. First of course is to make sure the case is not boxed in too tightly. There needs to be some space, especially at the back, to let air circulate. Some people resort to drilling holes or cutting huge gaps in the case, yes. Some people open the case (or don't put the cover on, if the case is designed in a single piece) and simply point a big box fan at it!
Lots of SETI@HOME people do this with their dedicated SETI machines. The temperature of the room around the machine makes a big difference even with a normal 'closed' case, though. You don't say what sort of case it is, but I'd bet it's a normal 'mini' or 'mid-size' tower, and those aren't very well designed. For your next system consider investing a bit extra in a case especially designed to have good air-circulation and help keep your system cool.