Three ways..
1. install the drive from the old computer as a slave to the new, and copy
at leisure..
2. copy files to a cdrw, and transfer to the new pc
3. network the two computers using network cards and a crossover cable..
If you do not have a cdrw in the old machine, I would suggest that you go
for option 1 as it is easier maybe than trying to set up a home network..
Good luck