This has been an ongoing problem. I've checked to see if there was that box checked for "snap to default button," however, it was never checked. I ran a scan for the "peper trojan," but those files were not on the system. I ran a couple other virus scans and malware scans, but to no avail. I did also run a Hijackthis and will include the log file below. I haven't messed with drivers yet because it is the embedded mouse for the tablet I'm using. I don't use any other mouse devices. I do use a tablet pen regularly. The problem is frequent and random. I can see it happening from across the room, which is to say, I'm not hitting a button by accident. There is no external mouse or wireless mouse involved.
Hoping for a ray of light.
Thanks in advance