how do i overclock my celeron 600 when my motherboard is jumperless and i can’t do it through the bios? what is some good software that i can use from windows?
just open the trash bin, throw away the celeron 600 and buy someting new… 
independent of what you will buy, it will be definitely be much more faster…
you could also try a tool such as CPUFSB from http://mitglied.lycos.de/podien/ - maybe it works for you, but use it on your own risk…
http://www.geocities.com/enigmadeadsouls/softfsb.html - the old SoftFSB - maybe the motherboard is old enough to be supported.
You are not going to turn a 600 celery into a super-beast
You might get nothing at all (no supported adjustable PLL).
You may well hit instability very soon as the PCI frequency rises with FSB - this can also result in IDE data corruption, as the IDE interface will also be overclocked.
And you could trigger a catastrophic failure.
You could maybe pick up a very cheap second-hand PC, it’s bound to be quicker than that one. My lad bought a faster one with his pocket money (£5) and sold it on.