"Not responding" then memory dump, and failed restart

So, I tried to look over these forums a while before posting, but things didn't really help. I also tried to find my memory dump files to post, but there's no "minidump" file in my windows folder.

What happens is I'll most often be browsing in Firefox (I dont do much else recently on this laptop) then firefox will freeze, I'll wait because sometimes it unfreezes and continues on its way. But more recently it wont stop, or it will unfreeze then a few moments later go directly to the blue screen and do a memory dump. I can't find those files (Is it possible settings were changed not to log those? Where can I go to change that back?). Because it's firefox that does this, I did uninstall and reinstall firefox, but that didn't do any good (since it lagged about three times while posting this).

It then restarts, but on restart comes to a screen that lists something about our Ethernet card, then says something about how the media card failed to load... then it says it can't find the boot disk, and to enter it then press any button. Which we don't have a disk. So we'll shut it down and restart it. Eventually it gives us the option to start in safe mode. Then we shut down again, and then windows will load like usual.

Though I don't have the memory dump file I do have my msinfo that should be attached. Hopefully someone can help me with just that info, since I'm pretty lost. Thanks!

Oh, yesterday I did a system restore to see if that would change anything, it didn't. And this morning when it did it, I did a memory check and passed.

Poo, no one?