NTFS is a journaling file system. Esp. if you have battery backup on you system, when you have a lockup or power out, you tend to get some corrupted files, but not a corrupted file system.
As example on another OS. I used to run Linux with ext2 file system. If I had a lockup or power glitch, I had to run fsck on the next boot to fix the file system. ext3 is a journaling file system, so if the same thing happens, it checks the journal on the next boot and any operations that weren't successfully completed are rolled back. So, like NTFS, you may have a few corrupted files, but the file system is ok.
I just periodically right click in Explorer and use the Disk Tools to check the disk with the "fix file system errors" unchecked. If it's healthy it comes back and says there was not a problem.
If you check the option to check all the disk sectors, plan to let the machine churn by itself for hours and hours. Unless you are getting corrupted data, or suspect the drive is on its way out, I wouldn't bother.