Good Afternoon, I am new to the forum and have been browsing for a few days now, I decided to join up in the hope that you could help me. My laptop has been playing up for the past few days. There have been a few problems running in parallel. 1) When I try to join any network (I've tried more than one) - it won't connect. It will either display it is "unable to find a certificate to log me on to the network" or it will appear "aquiring network address" for a lengthy period. The usual repair function is ineffective. 2) When I use Google Chrome, it will not let me access various sites. A red screen appears with a message saying "The site's security certificate is signed using a weak signature algorithm!". And when I use Firefox or the odd occasion the WiFi will link up - I am often getting redirected to virus-like sites. So far, I have ran Avast on a quick scan and placed the infected files found in the chest and also ran MalwareBytes. None of this has proved successful. Any help would be greatly appreciated. N.B. I may take up to 24 hours to reply as I have to use the work's PC. However, I will naturally try to be ASAP.