Google-chrome – Chrome: any way to zoom a single page, not all pages in domain

You have network issues and data corruption.

1. Get yourself a new clean profile, make sure you don't synchronize it with Google and stop using software like CCleaner (it breaks it down). If you don't want to really stop it, you could opt to deselect Google Chrome in it and instead clean your cache through Google Chrome itself. Or rather, set the settings right and just don't care...

2. Then inspect chrome://net-internals and fix your computer's network.

3. To inspect browser start problems, pass --log-net-log=C:\blah.txt as CLI parameter.

Try deleting your DNS cache. Since you mentioned Windows 8.1, I will provide instructions for Microsoft Windows.

#1: Get to a command prompt. If you're using UAC (likely), get to a UAC-elevated command prompt. (So, find the icon for your command prompt, and choose "Run As Administrator".) I've used the CMD command prompt more often, but I would expect PowerShell to work just as well.

#2: Run: ipconfig /flushdns

You can also use the GUI to repair the adapter, but that does some more stuff which is typically unnecessary. (So, that is slower.) If you find the above steps too tedious to do regularly, consider making a batch file so all you have to do is to run an icon (double-click on the desktop, or have in your Quick-Launch bar.)

If that doesn't work, try using the GUI to repair your network connection. When it asks you about resetting the adapter, see if you get good results by saying yes. If so, that may be quite tedious, but still better than a full reboot.