Wireless keyboard not working with Boot Camp

I have a brand new 15" Macbook Pro. I need to run Windows for work so I installed Boot Camp and Windows 8.1. I have a HP wireless keyboard with a USB dongle. It will not work at all. Windows recognizes that I've plugged in the dongle but the keyboard won't work at all. It's a brand-new keyboard and the batteries show full charge. All drivers look good in device manager. When I went thru the Windows troubleshooter, which is typically worthless, it said something about the dongle being USB 2.0 and the Mac's USB is 3.0. But shouldn't it be backward compatible? It has no problem with my old wireless mouse with a USB dongle.

I also notice a significant difference in the clarity on my dual external monitors with Windows instead of OSx. The colors aren't as sharp and the text isn't as clear - kind of fuzzy. Is that just how it goes with boot camp, or is there anything I can do, like maybe an upgraded driver, to get the same clarity on my dual monitors with Windows like I get with OSx?

Any help is appreciated.