That's good to move to Open Source
To Use Ubuntu :
Linux does not run Microsoft Windows Application, it's not support any Windows Application, Linus Full of Open Source Application , Work Better than Windows Application, but in Linux there is application to get best performance to do your job,
In Ubuntu , there is Ubuntu Software Center, you can find your different Applicatio that good to make your PC Smarter ..
You can find your alternative application in Linux, you have Open Office, Google_Chrome
,VLC player , Skype , and More ...
you can run Linux beside Microsoft Windows , Work Correctly , by Dual_Boot ..
You Can Download Ubuntu From Ubuntu Website:
Download Ubuntu Desktop
Recommended 64-bit , if your processor architecture support 64bit. if not choose 32bit.
you can burn it on DVD or USB-Stick..