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See this :
https://support.steampowered.com/kb_article.php?ref=4020-ALZM-5519#auth
EDIT..............
"more information...." at the bottom of that leads here :
https://support.steampowered.com/kb_article.php?ref=3658-TPXM-3237
And now the issue seems to have heightened, in that you cannot even log in, apparently.
So check your security programs and processes on your PC. It does not necessarily matter that you have not changed anything on the PC. Things can still change without you changing them. Make sure all security software and processes are leaving Steam and games totally alone in real time scanning.
Also, check browser security plugins and features.
One often-overlooked program that might be related to this is CCleaner. If it has monitoring mode set as active, that can be an issue with Steam. Disable that with CCleaner, or stop it from launching automatically on boot by using msconfig to do so, if that applies.
This won't fix the issue, because the issue is not with Steam.
Let's see :
1. Take screenshots of all of the programs you have installed on your computer. Control panel then programs/programs and features. (Windows 7,8,8.1) or "apps" (Windows 10 click "Start" (Windows icon on bottom left))
2. Click Windows Start and type in msconfig and run that resulting process. Go to the services tab and check the box on bottom "Hide all Microsoft services". Take screenshots of all that is left.
3. Then go to the startup tab on top of that same window (Task Manager in W10). Expand the header on the left so we can best see the process name (small window, so do the best you can). Take screenshots of all that there also. Don't forget to scroll down if needed and get everything in the shots, please.
Post all the links to the above screenshots here, using a file hosting site such as imgur.com, which is free to use.