Validating steam files? please help

After every restart of my computer my css needs to validate and i have tried to defrag the files and all but nothing seems to work.. can someone please help me

Let it validate.

Wait maybe 20-30 minutes. If it finishes, it shouldn't need to do it again next restart.

If that doesn't work, try deleting the hl2.exe file in CSS then have it re-validate. It should replace the file.

Okay thx for the help