This may or may not be a problem, just my paranoia: I just restarted my PC, and during startup I saw a CHKDSK check appear. I don't know why, since I didn't initiate it, but I let it run and finish.
The reason why it concerns me is not too long ago I was stupid and accidently unleashed a trojan on my PC. Luckily my antivir caught it, and for all I can tell I've wiped it out. However, I did run at least one utility program that wiped a lot of temp files, and somehow my Firefox profile ended up completely erased. (I don't know if it was that particular utility that was the culprit, but given the timing I assume it was.) That may be irrelevant, but the point is some damage was done to my PC, and I've been worried that more has happened that I still don't know about.
Here are the results from eventvwr regarding the CHKDSK:
Checking file system on C:
The type of the file system is NTFS.
Volume label is OS.
One of your disks needs to be checked for consistency. You
may cancel the disk check, but it is strongly recommended
that you continue.
Windows will now check the disk.
CHKDSK is verifying files (stage 1 of 3)...
Cleaning up instance tags for file 0x5.
Cleaning up instance tags for file 0x1e.
509184 file records processed.
File verification completed.
1159 large file records processed.
0 bad file records processed.
0 EA records processed.
818 reparse records processed.
CHKDSK is verifying indexes (stage 2 of 3)...
614216 index entries processed.
Index verification completed.
CHKDSK is scanning unindexed files for reconnect to their original directory.
5 unindexed files scanned.
CHKDSK is recovering remaining unindexed files.
5 unindexed files recovered.
CHKDSK is verifying security descriptors (stage 3 of 3)...
509184 file SDs/SIDs processed.
Cleaning up 618 unused index entries from index $SII of file 0x9.
Cleaning up 618 unused index entries from index $SDH of file 0x9.
Cleaning up 618 unused security descriptors.
Security descriptor verification completed.
52517 data files processed.
CHKDSK is verifying Usn Journal...
35547216 USN bytes processed.
Usn Journal verification completed.
Correcting errors in the master file table's (MFT) BITMAP attribute.
Correcting errors in the Volume Bitmap.
Windows has made corrections to the file system.
209715196 KB total disk space.
186856056 KB in 445406 files.
201352 KB in 52520 indexes.
0 KB in bad sectors.
617576 KB in use by the system.
65536 KB occupied by the log file.
22040212 KB available on disk.
4096 bytes in each allocation unit.
52428799 total allocation units on disk.
5510053 allocation units available on disk.
00 c5 07 00 0c 99 07 00 1f 46 0d 00 00 00 00 00 .........F......
6e 04 00 00 32 03 00 00 00 00 00 00 00 00 00 00 n...2...........
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
I don't know enough to interpret what this might mean, like the unused index entries. Does any of this look suspicious to you guys? Is it something I should investigate further?