If you want to have a clean install of just XP after having Linux installed, you'll need to nuke your Linux partitions and recreate NTFS partitions (XP will do this automatically). That means you'll need to run fdisk or cfdisk (google it). Once your partitions are cleared, plop the XP CD/DVD in and boot it up.

Alternatively, if you're doing a complete wipe of your system, you could use a low level format of your hard disks. The manufcaturer's website should have the tools you need.

Maybe you've already found your answer (I just found this post), but Eclipse (.org) is a great free tool if you plan to write the code for your site on your own. w3schools.com is a good reference if you're new to coding. There aren't many good graphic design programs freely available, though gimp.org may be of use. If this is your first time building a website, Gimp may be a bit much.

Flash is your best bet for animation. You can import just about anything into Flash, but it is a commercial product. To get you started, you could use the 30-day trial from adobe.com. If you just want to animate photos (like a slideshow), lookup "animated gif" on google. Furthermore, adobe.com has alot of trial and developer edition tools, which might be enough to get your initial site built. They also tend to post alot of beta stuff for free on labs.adobe.com.

I hope that helps!