Yes, when you "reformat" it erases the hard drive completely. It will be an empty drive, you will have to reinstall the OS from your disk/Apple internet or reinstall from a back-up after you do it.
When you reformat a hard drive you change it to whatever formatting you have selected and it will overwrite whatever format was used before.
Yes you will lose everything so just use a USB hardrive.
Reinstall Windows XP from your CD or DVD set and reformat your hard drive. This will erase everything including the virus. Also, get a Mac.
There are apps that will only work with Mac OS X which can be on any Mac computer - iMac, MacBook, Mac Mini etc.
no now there are so YESApple now has a software update for its Mac Software that allows for the use of Apps on your Mac. Just do a software update on your Mac and it will load the necessary upgrades.
Apps is short for Applications, the equivalent to Programs in Windows.
Games
One can find all Mac downloads in the Mac Apple Store, which hosts a range of apps for Macintosh PCs and laptops. These downloads range from productivity apps to games.
iPhone apps work on iOS devices (iPhone, iPad or iPod Touch) they will not work on a Mac running Mac OS X 10.7 (Lion) or any other Mac OS X version
yes but for a mac you don't have to format hard drives... so if you were to put a mac hard drive into a PC you would have to reformat it, I'm not completely sure how to do that
Not unless you reformat the drive, although if the drive is a different format like a mac and you have a PC you might have to reformat the drive just to use it
Visit app store or iTunes.