A bit of background, I dropped my laptop over a year ago and basically it screwed up the camera and microphone, I don't know if this is also a reason why my laptop runs very slow.
Then, after a few months went by, none of my programs would even open, I tried clicking everything/opening everything but it always said "Unknown Publisher," even to basic files on Windows 7. Even before this, I felt that my computer started running slow.
Anyways, I decided to wipe the whole system because of this, so it basically deleted everything and my computer can run. Now I feel that it's way too slow, it takes ages to load a web page, and I can't even play games like Skyrim, Runescape, or even Minecraft without it lagging so badly, and I can tell that when I first got my laptop, it wasn't this bad.
Here's basically my computer's RAM, I don't really know all about RAM, 
Is there any way to fix this? I don't have warranty or anything, so I feel like that's out of the picture.