I have two laptops, a tablet and smartphone which are all connected to my home wireless. When I use my laptop (Acer - Windows 7), the internet runs really slow and web pages keep timing out. This happens whether I use Chrome or Firefox. The internet also stops working completely on all other devices. As soon as I shut down the Acer laptop, the internet works on the other devices fine.
A couple of weeks ago I downloaded Bit Torrent software on the Acer laptop and this is when the problem started so I unistalled the software after a couple of days. I had McAfee antivirus software and Malwarebytes anti-malware at the time. I have unistalled McAfee and installed Avast Antivirus today and run full system scans with both Avast and Malwarebytes and they are not detecting anything.
The hard drive on my laptop is fully defragmented and has plenty of memory available. I also had Hola VPN add-on installed but I have unistalled this today too and this hasn't helped the problem. I recently installed Google Drive backup but have limited both the upload and download speed to 100kbps so I don't think this could be causing the problem.
I've tried restarting the laptop, resetting the modem and connecting to the internet via ethernet cable and none of these help either.
Any ideas of what else I could try? My husband and I both work online so need to use both laptops so this is really messing us up! Thanks in advance for any advice.