restore health command

hello a few months ago i discovered the dism commands(scan health,restore health e.t.c)but i have an issue:
1)i run restore health command and every time appears that i have ''corrupted files'' and successfully repaired'.'why after runing the command 1 -2 or 3 times during an hour always i have corrupted files?is it normal?also i run today first the scan health.it told me that i don't have corruption issue,but the restore health find it and repair it!!!so any one knows what is wrong?also i try to run the command ,after rebooting my system and running again the command ,but always find corrupted files!!!i have win 8.1 pro x64
sorry for my bad english

The sfc command fixes system file corruption while the dism command fixes system components, see here.

http://www.eightforums.com/tutorials/26512-dism-fixing-component-store-corruption-windows-8-a.html

Run the Dism /Online /Cleanup-Image /RestoreHealth then run the sfc /scannow command from the elevated command prompt.

Reboot the computer, you may have to run the sfc command a few times until no corruption.