I got this once in my 7 , Windows freezed copying a file in my 3790 sd and I had to force restart, at restart I got it and I run it without any problem
2011 01 23 194352 chkdsk G
You can try to run chkdsk from command
chkdsk /f where /f means fix errors, without it, it only shows errors.
You can begin without f to see if you have problems.