Ok, so here's the sitcheeation...
It actually has to do with my internet connection, not the computers themselves (I have 2 networked...a Mac and a Windows). First of all, I use Verizon DSL. For the past 6 months at least, my connection has been erratic...meaning, there will be times where I can't get online at all on either one of the computers. What I have had to do in the past to remedy the situation is reboot both computers, turn off both the modem and router. Then it would be fine for the next 3-7 days, then it would happen all over again where I have to reboot to get back online.
Lately, (I would say for the past month), it has gotten progressively worse. I can't seem to stay online for more than 15 seconds at a time.
Last year I had to replace the router because it wasn't working at all....so that got me to thinking, do I need to replace the modem now? Because the modem has to be around 8 years old...
I called Verizon a while back, and they said that the problem isn't on their end. Another theory I have is that my Macintosh is so old (at least 10 years old)...I've been having trouble with it lately...I guess you can say that it's pretty much on "life support right now.

SO, would an old modem cause these kind of problems? Or is there something else that I should be checking out?