Reading between the lines, it appears that you are sharing the internet connection through the Windows computer.
The first thing to try would be connecting the Linux computer directly to the DSL modem and see if things work correctly there. My personal choice would be to simply get a router. That will make everything easier to set up.
While you are sorting this out, stay with one distribution.
Finally, since you only joined us in October, consider giving it at least until Christmas before you give up....