Is a default network connected to the internet safe?

Hi,

I just got a fairly new hard drive from my sister, and when I started the computer, it already had a default network connected to the internet. I had a previous hard drive and internet connection setup, and I believe it was wireless unlike this new default connection. My question is, is it safe to use even when I turn off network sharing and use it as a home network or do I need to remove the default network and establish a wireless one? In other words, I don't want people connecting to this default network without a password.

If needed Windows 7, Dell, 32 bit. Using a router and modem as well.

Thanks for your time.

Thanks for your reply. Here is a screenshot of my specs.

Imgur: The magic of the Internet

Let me know if you need anything else.

It should be there Imgur: The magic of the Internet as that, unless links are not allowed.

I will type it in manually just in case.

CPU: Intel(R) Core(TM) 2 CPU 6600 @ 2.40 GHz

Motherboard: Dell Inc. 0MM599

BIOS: Phoenix ROM BIOS PLUS Version 1.10 2.6.6

Total Memory: 2 GB Usable: 1.99 GB

HDD: WDC WD800JD-75MSA3 ATA Device

Soundcard: SoundMax Integrated Digital HD Audio

Graphics Card: (1) Intel(R) Q965/Q963 Express Chipset Family (2) Intel(R)

OS: Microsoft Windows 7 Professional 32 bit 7601 Multiprocess

Let me know if you need anything else.

I just posted them manually but I cannot find it, however it did say approval pending. Just confused atm since it did not do so with the previous post. Nevertheless, do you have any suggestions for my "problem" or was the post more of a formal introduction/wait for future responses?