Need a new motherboard and cpu

[col20]

Hey all im new to the forums
Currently im running two computer one with a pentium 3 500MHZ and pentium 3 with a 1GHz i do realsie that i ned to upgrade these quickly but i have no idea when it comes to motherboards and cpus
i do have a lot of other easy stuff like gfx upgrades that i have done before but nothing that could seriously damage my pc

Any advice guys?

 

[col20]

Cheers for the replies

I dont need dual core or two graphics cards as i dont have a lot of money to spend i only have about £100
i would need min 512mb ram at probably the max i would need would be 2gb
pc is used for both gamin and office work but not cpu intese games, i play half life and op4.

I dont usually overclock my hardware as a just incase


Hope my answers help