Can't convert book to ANY format or send to device

I'm having so much trouble at the moment trying to send a book to my kobo touch device. I must have broken something because if I try to transfer a normal epub file (which transferred in the past) I get a no suitable formats found error



Also when I try to send a specific format to a device, the file type window is completely empty?




I'd like to remove calibre and start again. I tried uninstalling/reinstalling calibre and deleting the calibre registry key in regedit, but whenever I install it again, all the old plugins and settings are still there. I'm tearing my hair out because nothing I try seems to work.


Edit: I fixed this by deleting the caliber files in the AppData/Roaming and then doing a clean install.