Computers iTunes deleted, i have it on my iPhone still, can i ever sync again without deleting iphone?

The iTunes on my computer (pc, win 8) is deleted. I have it all on my iphone. That's OK. Now, I added (downloaded) a few songs into the empty iTunes. I want to add those songs to my phone, but when I connect and try different sync settings, it says it will DELETE everything on my phone. NOOOO! What to do? I am logged in to iTunes too, same user as always, same device. Why is this happening and what can I do? Will I never be able to add songs to my iphone without deleting everything? HELP!

2014-04-16T11:49:17Z

when I click 'manage music manually' and then try to 'apply' or 'sync' it says it will delete everything on my iphone

D2014-04-16T10:58:02Z

If you are able to access the screen that shows the phone settings in iTunes, check the box that says manually manage music and it should work.