I have a Macbook Pro laptop. I tried the comand + R but it seems like most of my apps are still there. Same desktop backround, all downloads and apps I installed are still there?
Looks like whatever you're trying to boot from won't work.
Did you follow Bart Kela's advice above?
Exactly WHAT do you want to do?
Do you just want to re-install the OS (while leaving everything else intact)?
Or do you want to COMPLETELY ERASE the internal drive and start over with a fresh copy of the OS?