Weddingbee boards

Hmm, unfortunately I don't think you can download Apple software onto a PC without having one of those drive partition things that allows you to run a different operating system. I know you can run PC stuff on a Mac, but it's a lot harder to on a PC. Also, maybe it's just my personal experience, but iMovie is incredibly confusing and difficult to use anyway (!!). Final Cut Pro is the best, but if you're editing on a PC, then I would try and get your hands on Adobe Premiere Pro. (I know some software is relatively easy to download for free if you look for it in the right places online, heh) I think danicalifornia is right, and a main concern would be hard drive space. HD footage can take up a lot of space, so make sure you clear some room, or get a cheap external hard drive! WMM should be fine though, and there are a lot of great online tutorials floating around if you ever get stuck. 

You know, if all else fails, while videography might not be in your budget, you could probably get someone to just edit your video for a much cheaper price. A good trick is posting editing listings on local film school job boards - you may be able to find a great deal as there are a lot of students looking to add to their portfolios/reels, and most have at least a few years of editing experience. Good luck! :]