Won't stop validating files

Every single time I start up Garrysmod it doesn’t load, but claims to be validating a single fucking file, and whether or not it’s finished it always does it on start up.

[editline]penis[/editline]

Already a thread about this, it seems, follow this link http://www.facepunch.com/showthread.php?t=478426

Manually validate Garry’s Mod.