If you install it along aside Windows, it will be easy to uninstall with add and remove (or the uninstall.exe in side the Ubuntu folder), I don't have that much experience with Linux, I've tried Ubuntu and Kubuntu, but I have to say, I'm still a Windows fan.
When you install it, it would be best to install around 5 gig or so, you don't really need much more, cause you should have it on your Windows partition, the 5 gig is just for programs really, I haven't had much luck with Ubuntu, my desktop PC, has an old graphics card, and displayed it in 600x400 resolution and wouldn't allow me to display any higher, some guy on Ubuntu forums write a script for me to fix this, but however the top of Windows with the Minimize, Maximize and close, would not display after that, and the problem with having it on my laptop is, the wireless, it detected my Modem, but couldn't connect to it, maybe you'll have better luck though, Kubuntu worked Ok on my Laptop, but it's just not the same as Windows, I still recommend trying it though.
You can order a free disc on there website, it just takes a few weeks, as it's free postage, it's very good to keep one handy, as you can get onto your PC without installing it with the demo version and save some files if your Windows fails to boot due some problems.
When you install it, it would be best to install around 5 gig or so, you don't really need much more, cause you should have it on your Windows partition, the 5 gig is just for programs really, I haven't had much luck with Ubuntu, my desktop PC, has an old graphics card, and displayed it in 600x400 resolution and wouldn't allow me to display any higher, some guy on Ubuntu forums write a script for me to fix this, but however the top of Windows with the Minimize, Maximize and close, would not display after that, and the problem with having it on my laptop is, the wireless, it detected my Modem, but couldn't connect to it, maybe you'll have better luck though, Kubuntu worked Ok on my Laptop, but it's just not the same as Windows, I still recommend trying it though.
You can order a free disc on there website, it just takes a few weeks, as it's free postage, it's very good to keep one handy, as you can get onto your PC without installing it with the demo version and save some files if your Windows fails to boot due some problems.