Don't bring it to school, it is at risk of getting stolen. Happens all the time, trust me!
I've used both the PC and Mac (and still use and have both) and prefer the mac hands down. It depends on personal preference. Macintosh are absolutely NOT virus-proof, YES they do get tremendously less though. That is because viruses that work on the PC cannot work on the MAC and vice versa. Since PC's represents over 90% of the computer market and MAC only 8%, it is not worth it for most virus writers to write mac viruses because they target a very small percentage of the audience. That is why they get less. I would still recommend installing virus software on the mac if you have since the viruses are still out there.
Macintosh are not faster at all. It doesn't really depend on whether it is MAC or PC. What mostly matters is hardware. RAM, Hard drive integrity, and processor speed are what mostly matter. Viruses and malware can also cause a computer to be slow.
IMPORTANT:
Since Microsoft markets their products to other companies, there are by far many more PCs to choose from. Here is how I would rate the following companies by product:
1. Toshiba (best laptops for PCs!)
2. HP (Great computers altogether and customer support is great!)
3. Dell (Ahh, soso, but satisfactory.)
4. Sony (ahhhhh, SUCKS. I had a Sony laptop that kept freezing for years. I repaired everything and nothing worked. Four of the keyboard keys fell off while typing, they were plastic!)
I'm not sure about the other companies.
The MAC on the other hand, your stuck with Apple's computers. I would recommend the Macbook for you if all you are going to do is edit documents etc, but nothing crazy like graphic design. They are expensive though and you can get a PC for much cheaper. However, the Mac operating system is great and easy to use. Keep in mind that if you have Microsoft Office for windows, it will not work with Mac. You'll need to purchase Microsoft Office for Mac seperately, sorry. I would recommend getting like Office 2008 or 2011 as they're the most recent versions. You could probably get a cheap version on Amazon. If you do get a Mac, wait though as the OS X Lion will be coming out. Right now it is OS X Snow Leapord as the default operating system so if you get one now, you'll need to upgrade and spend more money. Avoid that and get one in Summer 2011 when OS X Lion will become the default. It has many new features that are great like the app store and has stuff very similar to what you can do on the iPhone and iPad. Here is a sneak preview.
http://www.youtube.com/watch?v=fsUYHrsYa2U
I've used PCs most of my life and just recently started using Mac about a year and a half ago. Yes, the operating system is different and you'll need to learn how to use it, but you'll eventually get the hang of it as I did. Only took me a few days to figure it out. Here are some important differences:
1. When you close an application on Windows, you just click the X button. On Mac, there is an X button but that will just close the window. After, you need to go up to the upper left corner and close the application. If you don't you will be running many apps at the same time and not even now it causing the computer to slow down.
2. On Windows, you use the control panel. On Mac, you use the system preferences which is simple to use and organized. Love it!
3. To delete an application on Windows, you need to go to the control panel to delete under add and remove programs. On Mac, so easy. Go to the Application folder and select the desired application or program and just drag it to the trash on the dock, that simple!
4. Mac downloads are a little different. On windows, most downloads are followed by ______.exe. On the mac, it is ______.dmg, just in case you aren't familiar with it, that is what it is. Nothing to worry about.
5. To configure disks, go to the Utilities folder on in the Application folder and select disk utility. Very easy to use but don't mess around to much as you don't want to accidentally erase all your data. On windows, it is so much harder.
These are the five largest differences that I first saw, so I thought I'd point them out. If you do get a Mac, buy it on the Apple website because you can customize what you want built in.
Hope this helps!