System Upgrade

I'm new to Linux. Used windows many years. Just ran an update using the update manage and now running Linux Mint Cinnamon 19.3 version 4.4.8 with the Kernel at 5.4.0-generic. I have a Windows 10 version 2004 (the latest) laptop and an old desktop running Linux. I have them networked together using my wifi router and all worked well prior to this update. Both machines could see other and I could move file from one to the other with no problem. The first time I attempted to connect from the Linux machine to the Windows machine, I had to enter my password on the Linux machine which is normal. However this time the password screen is in a loop and will not connect. Each machine can ping each other. The Windows Machine can see files on the Linux machine and can grab them but the Linux machine can not see files on the Windows machine. Since I'm new to Linux, where do I begin to do additional troubleshooting? (I hope all this makes sense)