If your good with programs, try using stuff like: "Adobe After Effects". "Adobe premiere". "Final Cut". "Sony Vegas". Those bad boys should be more than enough to upload stuff into YouTube. And if you wanna edit your sound separately (which is what is done on most HD movies, vids, ect), than there are easier programs such as "Sony Sound forge", "Wave Lab", "Nuendo", "Pro-tools", "Adobe Sound booth", "fruity loops". None of these editing programs are free, of course.
And, no. Your internet browser and operation system pose no problem. Though you should switch to Windows 7 because Vista sucks. Like, ****.