That probably has to do with events like this filling up the first half of the syslog:
Log Name: System
Event ID: 55
User Name: N/A
The file system structure on the disk is corrupt and unusable. Please run the chkdsk utility on the volume DATA.
Same is said for volume D:, which I presume is the same thing? Either way, it needs fixin. Do a chkdsk on all your drives. If you don't know how, right click the drive, then go to Properties, then go to the Tools tab, then "Check now..." button under Error-checking. Select both
options, and click to attempt to check. It most likely ask you to schedule one at next boot up. Do so for each drive, then restart PC. This will take a while to run.