What should I Do?

[Paradigm718]

Hey i tried to copy everything from in my device memory into my storage card. While copying them I would delete the files from being saved on my device (to create room). Now i am hit with that problem of the programs I use to have are not showing as being installed anymore. And even when I reinstall them. It keeps saying the it was unsuccessful. without giving any info on why. I think i deleted something in the phone that i wasn't suppose to so i am not sure what i should do. Should i try to return it? Does anybody have an idea of what i deleted that is causing me not to be able to install anything on my phone.
I need some help