You people know nothing...
Read this : http://forums.steampowered.com/forums/showthread.php?t=840234
If it doesn't work you can try to delete vgui which is located in Counter-Strike:Source>cstrike>models
You can also put your spray inside vgui folder.
If nothing happened tell me and I will research for other solutions.
p.s Delete your cfg folder files which is located in Counter-Strike:Source>cstrike>cfg . (Download http://www.mediafire.com/file/xmbc747khc8uq7m/config.txt & http://www.mediafire.com/file/9onskb5gmfkbanq/autoexec.txt and place it in your cfg folder)
Read also this : https://steamcommunity.com/app/240/discussions/0/864977025900461447/