Files won't play and more...

[untinnu]

ok..so I've got 2 problems..I think..

First of all, when I transfer files from my laptop to my Tilt, some of it won't play. I checked the format and it's fine. They're all MP3 formats. And also, my AVI formatted videos won't work either. Help? Do I need to use a different player for the videos?

Second, when I delete something from my Storage Card (4GB), it goes away for a while, but when I go back and check that folder, those files popped up again..though I can't play it anymore..again..help please...

~EDIT~

now third, when I try to install programs, (nothing much, just tcpmp and others) it says that it was unsuccessful....so..help?