The ACPI errors are most likely not relevant here. They seem to refer to an inconsistency in your system's ACPI tables referring to the ACPI embedded controller, and possibly to GPU. All those messages are output within the first second of kernel start-up: the timestamp at the beginning of the lines is
[ 0.957786] or less.
The lines with the timestamp
[ 37.871909] or later indicate that a (S)ATA
READ FPDMA QUEUED command has failed on
ata6.00. In other words, your disk reported that it cannot perform a read command that was sent to it. Yes, that is a pretty strong indicator that your disk may be failing.
error: no such device: EEBACEF9BACEBCF9 might be caused by a UUID reference in
/etc/fstab referring to a failing disk.
EEBACEF9BACEBCF9 looks like a filesystem "UUID" the
blkid command might display for a NTFS filesystem. So I think your
/dev/sdc disk might be dying or already dead, since you said that's your Windows disk.