There are many situations when you need to have clean installation and be sure that it is without any trojans and viruses. Also that connection will be encrypted and so on…
There are many live-distros with linux which you can boot and you have clean instance. How about running linux without rebooting withing windows ?
You can do that by setting linux on flash drive and including QEMU (virtualization software). You can read more here.
Want to have more search options when doing google search ?
Install Google FX Adds as Greasemonkey plugin and you will get many new features. You can read more here.