Constant Beeping And Loss Of Mouse Control

Since I upgraded from 8.1 --> 10, I've occasionally been having an issue where my my PC constantly beeps (through the normal speakers) and I lose control over the mouse. URL....Beeping sound is playing through normal speakers, not from inside the tower. I have limited movement of the cursor, but unable to click on ANYTHING.I've been trying to narrow down potential causes, by disconnecting various input devices. One thing to note is that this sometimes occurs WHEN an input device is disconnected or reconnected. These devices include:

-Logitech G502 mouse
-Corsair K70 Keyboard
-Logitech M310 wireless mouse (sometimes used for control of Netflix from my couch)
-Saitek X-52 Pro Hotas (with programming software)
-CH Products Flight Pedals
-Xbox 360 controller
-and another thing-

a program called "SVmapper," which enables the use of the eight otherwise useless buttons on the base of the X-52 Pro's throttle. Normally, those buttons are used to start and stop a small timer built into the throttle, change modes, and generally very useless crap. SVmapper intercepts those button presses and instead outputs a keyboard command to the video game in use. (For example: the x-52 doesn't have enough buttons for me to map essential controls AND landing gear control to the hotas. When I use SVmapper, it gives me 8 extra usable buttons!) [URL] ....

I'm suspecting SVmapper, but I have yet to prove or disprove anything yet. According to my searches, I've heard of a (somewhat) similar problem in Windows 8 related to StickyKeys, FilterKeys, or some other UselessKeys option. I've tried disabling all those, to no avail.For reference, here is my current build: URL...

Only way I can regain control of my PC is by holding the front power button on my tower. I've tried Task Manger to stop processes (doesn't work) and rebooting with ctrl+alt+del (also inoperative). I'm trying to at least make this PC last until I can get a Skylake CPU (+motherboard +appropriate RAM).