I've been dual-booting Kubuntu and Windows 7 for a couple of weeks and I've been able to boot into Kubuntu just fine until this afternoon. Now when I choose Kubuntu's entry, instead of the regular bootloader I get the grub prompt screen saying "Minimal BASH-like line editing is supported.", etc. ls in that prompt yields the contents of my C drive.

I've tried using the live CD to run boot-repair twice to no avail. This is the link to the paste from the first time I tried: http://paste.ubuntu.com/1147414/ I tried again after creating a new partition to use as a boot partition. This is the paste I got after that: http://paste.ubuntu.com/1147492/

I can't think of anything I've done that'd make the bootloader suddenly stop working; Windows ran chkdsk last night but I booted into Kubuntu once after that. Help would really be appreciated; I really don't want to struggle through reinstalling Kubuntu yet again.