Upgrading Electrical Service

I have an old bungalow with 60 amp wiring. I only have a half basement, the rest being crawl space. Does anyone know if this would present a major problem if I were to want to upgrade to 100 amp service?

I have an outlet with wiring similar to the description on the following page [url]http://doityourself.com/electric/electconnectb.htm[/url] titled "Splitting a receptacle on a push terminal." How do I change the wiring to keep constant power to the outlet, in the middle of the run instalation, and have power going through the switch to a new wire that I placed going to a new light fixture? This is what I tried: In the outlet box: From the three cables coming into the box, I connected all of the black wires and pigtailed from there (extra 6" wire) to the outlet. I did the same with the white wires and the ground wires. In the switch box: I changed the wiring to have normal single switch wiring (black into and out of the switch with the white and ground wires pigtailed separately). This new wire out of the switch box goes to the new light. Result: The light works great with the switch, but now the outlet does not work. Maybe the power is just bypassing the outlet and going straight to the switch??? Thanks for any advise.