windows couldn't detect network's proxy settings

Having Internet connection issues--sometimes I can connect, but only get "2 bars," other times nothing. I am using a wireless router, and have another computer connected to it, and I get the internet with no problems on the other one. Couldn't download TSG SysInfo on computer with problem. Tried to give info can, please let me know what else you need to know, and I will try my best to answer.

Microsoft Windows 8.1 Home Premium
Dell All-In-One Desktop Computer
Intel Core i3-3240T CPU @2,90GHz 2.90 GHz
4 installed RAM
64-bit operating system, x64-based processor
Antivirus: avast! Antivirus, Updated and Enabled


Steps I have taken: Troubleshooted connection, and received the following error: windows could not automatically detect network's proxy settings. Ran "network troubleshooter" and I think it reset the connection and said all was fine.

Any suggestions would be greatly appreciated.

Thank you so much!