I really would like to uninstall Windows Live Mail

i Have suddenly encountered Windows Live Mail.  Before this morning I had never really heard of it or thought about it.  I was trying to send a photo from Picasa3 as I always have done for the many years I have had Picasa.  This morning this Windows Live Mail dialog box popped up (never seen it before).  So it was the only option available so I clicked on it.  Then I get an error message telling me that I couldn't use Windows Live Mail to send the photo.  I ended up saving the photo to desktop and then attaching it to the email.  Stupidest thing I have ever seen.  I don't know what I have done to make this Windows Live Mail dialog box suddenly start appearing on my computer.  I would like to get rid of it and go back to the gmail way of sending photos from Picasa3.  Any solutions from any one?  I really would like to uninstall it but I am afraid that it might affect other things.  I am not very computer savvy so I have done nothing yet.  Thanks for the help.  Jackie1b

[Original subject: Windows Live Mail]