"Defragmentation of Local Disk (C:) has been aborted due to inconsistensies in the filesystem.
Please run CHKDSK or SCANDISK on Local Disk (C:) to repair these inconsistensies, then run Disk Defragmenter again."
I have absolutely no clue that this means, I have run CHKDSK, and it deleted a few index entries from iTunes. This has never happened before, but then again I'm not sure since I use TuneUp Drive Defrag (I bought the full version) 95% of the time, and I don't get any error messages from TuneUp...
As for system performance, I can't complain. My computer is in top-shape, but I'm just wondering how to fix this problem and/or if it's computer-life-threatening.