Hey guys, so everyime I want to use anything java (Mainly Minecraft), it says that there is no java runtime installed. So I went to the java webite and reinstalled it. But when I try again the same error comes up. I look in the java folder in my computer and everything is installed.

This error started to happen when I plugged it an MP3 and installed java to it. I started the installer and it said that I already have this program download on this computer. I asked to uninstall it so that it could install Java on the MP3. After a while I realised that anything java would only work IF and only IF the MP3 was plugged in. The first idea that came to my head was that I uninstalled java and reinstalled it onto the MP3 player. But I don't want to keep the MP3 constantly plugged in. What really confuses me is that I cannot reinstall it onto my computer.

Could anyone please help me out on this? I would be very greatful and happily +REP the person who finds the solution.