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I am not even sure where to post this because it is such a bizarre problem, and since I am not sure it is a hardware problem, I am posting it here since I am running Windows 8.1.
For two days now my computer has been going haywire. I ran Windows Defender and Spybot - no serious issues, no viruses. I rebooted, did a hard boot. Still the same issue. The only way I can describe this issue is by saying it's like someone is constantly and rapidly clicking Tab on my keyboard - without me touching anything. My cursor will not stay in one place. This starts and stops throughout the day, usually every hour or two for maybe 30 minutes at a time. So it does stop eventually but not for long. I am unable to use my computer at all when it is happening because it keeps tabbing from where I need my cursor to be, so I can't type anything. I can't install anything. I can't open anything. It just keeps tabbing all over the screen and doesn't stop. I've tried hitting numerous keys like Shift, Ctrl, etc. but nothing stops it from moving.
The day this started, Bell (telecomm company here in Canada) came and installed a Fibe box and a wireless access point/receiver for my internet and cable (looks like this: http://www.arrisi.com/products/_images/hd/vap2500.jpg), which are on my computer desk. They said the wireless receiver needs to be two feet or more away from the Fibe box at all times, and it has been. I still have no idea if this was actually caused by either Bell device, but it was a weird coincidence it happened the same day of the installation.
Because I have a wireless keyboard, I thought maybe the receiver was interfering with the keyboard wireless signal. So I moved both boxes further away. Same issue. I then disconnected the wireless keyboard and used a wired one - same issue. I even popped the tab keys off the wireless keyboard to ensure nothing was making it stick. My mouse is wireless and runs on batteries. I can't see it being a mouse issue but perhaps someone can enlighten me.
This is rendering my PC unusable and I am in the process of job hunting right now, so I need to get this solved ASAP. I'd be grateful for any insight or suggestions people may have. Please let me know if you need any further details.