I recently installed on my computer (along to Windows 7) the Ubuntu 12.04 I downloaded rEFind software that I could work with both systems (and it worked just fine) I updated the Ubuntu to the newest version, 13.04 version. Now, the EFI doesn't work with that version. I tried to do the same as I did before and now it's making me problems and I can't even enter Windows.
P.S: In the meanwhile I'm using GRUB 2 and I'm new with Ubuntu.
Thanks in advance.