Windows 7: Upgrading my my hardware?

I don't want to go out and buy a new computer, but I was wandering if I could fit maybe a better processor in my casing (shell) or maybe more RAM? Better graphics card?

Are we talking about a laptop or desktop?

Laptop.
If it was a desktop, it would be obvious it would be able to fit more in. Unless it had a tiny shell.
My specs are in my System Specs

The processor and graphics card are usually unable to be changed. Although you should be able to add more ram if the laptop allows it. You'd have to look up what the max ram is for the laptop.

How would I find that out?

Manufacturer's website, use the serial number usually found on the bottom, look for Product Specifications.....that would be where I would start.

I tried, it didn't give me much information.
It only told me my max ram. I'm also wanting to find out if I can upgrade my processor and graphics card.

That would not be something I would attempt, unless your ultimate goal is to potentially trash that laptop so you can justify buying a new laptop...................then I'd give you a thumbs up man.......................

EDIT: I think you would get more performance out of a SSD than a new CPU.........might look into that.

Increasing ram will not help much cause you already have 4Gb . Since you cannot upgrade cpu and gpu ,i would suggest you replacing your existing 298Gb HD to 650GB HD.
A computer will start to suffer performance problems when disk space is low, or when the disk is fragmented. Defragging the hard drive and adding disk space, either through partitioning or moving applications and data off the primary disk will improve performance in those cases. If you have plenty of space on your primary drive, just keeping it defragged will produce the best performance.
You won't find that more hard disk space will increase speed, but it may boost performance. When drives get full, data gets fragmented. With smaller size disks, and smaller allocation units, a program may need to visit many different areas of the disk to retrieve the information requested. In the case of smaller disks, this is harder to avoid. That is why newer larger disks don't get nearly as fragmented nearly as quickly as in the days of smaller disk sizes.

See if you can get a SSD into that - bang for buck, that will be your single biggest performance enhancement.