Upgraded 98 to me

Question

I have a Dell Inspirion, I tried to upgrade from my 98 to ME and yes should not have done it. so now when i go to boot up it will not boot up fully all i get is my desktop background and mouse no buttons icons anything so can not do a single thing. i have rebooted several times with no change still not able to get anywhere. I hate to lose all my files and pictures any idea on how to fix easily?? Thanks