What operating system? If this is Windows 8, you should take it back to where you bought it. If this is Windows 7, try to get into safe mode. If you get into safe mode, that can open up some additional troubleshooting options.
Not worth the money or effort, in my opinion. I would buy a new laptop and install a SSD. It depends on what you are using the machine for, though. If it is just a cheap machine to browse the internet and check email, you might be better off removing Windows and installing Ubuntu.
Is the...
There are plenty of guides on the internet for making a bootable USB flash drive. Search and you will find them. If they don't work, it is possible you aren't setting your BIOS up to boot from the USB drive or your BIOS isn't compatible.
Why do you need a laptop? If it is for space, you could build a good gaming PC in a microATX case for much less. If you need something to carry to class, a gaming laptop is going to get very heavy. A tablet would be a much better option for taking notes if you must have a digital device in...
Most laptops don't have room for a second hard drive. You can replace what you have and migrate your OS or reinstall your OS. If you need extra storage for media, get a NAS or a decent external drive.
I highly suggest using a SSD for your OS and games. This may require some uninstalling of...