You'll need to root your phone first.
There are a few ways you can go about doing this. One if renaming the files so they aren't active. The other way is to download an application like Titanium backup where you can uninstal them from there. This is what I do. JUST be aware that if you do something like update the s/w or whatever it will bring them back and you'll have to re uninstal them.
ALSO be careful what you uninstal. Sometimes it can cause some issues.