Help - Multiple Error Messages - One Computer

A month ago, I purchased a Toshiba Satellite P205D with preinstalled Vista.
Things were just fine until a couple of days ago when it lost its network and
dial-up capabilties. I have tried various fixes recommended in this forum
and my frustration level is now at an all time high. I tried chkdsk, but was
told my status wasn't "elevated." I am the sole user of the computer.
Anyway, I have received the following errors:

1. Error 633: Already in use or is not configured properly (for dial-up);
2. The dependency service or group failed to start; and
3. Computer does not have a network adapter installed.

Any help will be greatly appreciated. Thanks in advance.