Problem windows 10 with multiple monitor - HELP!

I have a new Mac Pro 3.7GHz quad-core with 10MB of L3 cache, 16GB (4x4GB) of 1866MHz DDR3 ECC, 1TB PCle-based flash drive storage, Dual AMD FirePro D300 GPUs with 2GB of GDDR5 VRAM each purchased May 2015 and I use BOOTCAMP for work using WINDOWS 8.1. I am now very comfortable with the new Windows so I upgraded to WINDOWS 10. Then POW - at first my HDMI monitor worked but not my Thunderbolt. Then I restarted and now my HDMI monitor doesn't work anymore. HELP! HELP! HELP! I would like to keep using two monitors and really don't want to buy another Thunderbolt $$$$.

Afraid to update my MacBook Pro to Windows 10 until I find a fix.

Anybody out there who can help me fix this!

My appreciations in advance!!!!