WiFi stopped working randomly on custom PC

Problem started a few weeks ago. Not sure exactly if anything changed on my PC in terms of software. I know there have been no hardware changes. I am having horrible WiFi capabilities on my PC. Every other device in my household works perfectly fine. My PC is custom-built, running Windows 7 64-bit Home Premium. The BIOS and drivers are all updated. I was using a TP-Link USB WiFi adapter, which seemingly out of nowhere started running slowly. Then, the Internet would disconnect randomly and intermittently, or slow to almost a crawl. Since then, I ordered 2 more WiFi adapters (Panda and Linksys). All 3 adapters seem to work just fine on my laptop. All of them do the same thing on my PC. Oddly, the Linksys adapter worked beautifully for a couple minutes right after the installation. However, it eventually went back to horribly slow download speeds and/or intermittent connection. Nevertheless, I know the problem is not with the adapters, since they work fine on other machines. I have tried swapping out my keyboard, mouse, etc. with all of the available USB ports to no avail. The keyboard and mouse work fine in all of the USB ports, but the adapters don't work no matter what ports I use. Recently, I ran CCleaner, cleaned up the system and registry, did a fresh install of the WiFi adapter, and still it sucks (again, though, the adapter worked GREAT for a minute or two, then the connection pooped out). HELP??? Never seen this problem in all my years of building PC's.

#1 - How is your antivirus situation?

+ Would you post a screenshot of the Wireless Network Connection Status (double click on your network adapter)?

doctore said:

#1 - How is your antivirus situation?

+ Would you post a screenshot of the Wireless Network Connection Status (double click on your network adapter)?

I'm using Avast Free Antivirus 2015. I have run a full system scan and everything is good.

I just did a fresh install of Windows 7, and the same problem exists. I'm wondering if it's a power supply issue. I checked my voltages in BIOS and they are all perfect, so I don't think that's it. Motherboard issue?

Would you post a screenshot of the Wireless Network Connection Status (double click on your network adapter)?

Imgur

Well, your speed is 65Mbps, which is about right for a wireless connection.

Download a trial of Kaspersky Total Security or Eset and run another antivirus scan.

doctore said:

Well, your speed is 65Mbps, which is about right for a wireless connection.

Download a trial of Kaspersky Total Security or Eset and run another antivirus scan.

I just did a brand new install of Windows with a formatted hard drive. First thing I did was install the network adapter and still no connection. Also, I have installed Malwarebytes and Avira just in case and both are clean scans.

I'm wondering if there's a definitive way to test the USB controller and/or power supply. I know the voltages in BIOS are perfect, and my USB keyboard and mouse work fine.

dannyjerome0 said:

doctore said:

Well, your speed is 65Mbps, which is about right for a wireless connection.

Download a trial of Kaspersky Total Security or Eset and run another antivirus scan.

I just did a brand new install of Windows with a formatted hard drive. First thing I did was install the network adapter and still no connection. Also, I have installed Malwarebytes and Avira just in case and both are clean scans.

You don't have connection to the Internet or to the network?
Can you run ipconfig /all at the Command Prompt and post the results?

P.S. Your USB and power supply are not the issue here.