Yes it should be for the most part virus' and spyware are coded to destroy Windows you can have as many virus' as you want on a Linux or UNIX system and for the most part it will not affect them as the code us useless.
But you are still subject to boot loader hijackers you may contract when using Windows.
ok. look up pear pc. its an emulator and their page(http://pearpc.net/links.php) has a bunch of tutorials on how to do this. the bad thing is that you need to have the actuals os installation cd's, or an iso to install the os into the emulator