That's a laptop, right? Does it have a synaptics touchpad? Is there an icon in the task bar that looks like this:
Click to view attachmentThat's exactly what happened to me when I first got this laptop. Visit this page, and then drag your finger down the right side of the touchpad, right next to the edge. If you're using IE, it will change to that icon (firefox doesn't for some reason), and it will change in most other programs to that icon, too. why does it look like that? Well, you should have figured out by now that what it does is it scrolls the page up and down. So that little bar is supposed to represent the scrollbar. You can use the touchpad to scroll right and left, by dragging across the very bottom of the touchpad, or up and down, by dragging on the right side of the touchpad. I find this really useful; it's like having a mouse wheel, but if you don't like it, right click on that icon above and choose Pointing Device Properties. You can change all sorts of settings. Also, if it seems your mouse is randomly clicking, right-click on the icon and uncheck "Tap to Click". If you tap the touchpad, it registers a click, which is usually very annoying and causes unwanted clicks, so I always turn it off. I think that is the issue. Hope that helps.
PS: Welcome to MSFN!