error as textures and missing files

i just bought gmod yesterday and i happend to find alot of errors in alot of server
for example:
http://www.google.co.il/imgres?q=error+garry+mod&um=1&hl=iw&client=firefox-a&hs=QgN&rls=org.mozilla:he:official&tbm=isch&tbnid=wiLo3X_lD4ZbnM:&imgrefurl=http://www.facepunch.com/threads/141384&docid=EjuvutyB9v6W_M&imgurl=http://img197.imageshack.us/img197/2334/dodcharliesource00013nt.jpg&w=1024&h=768&ei=w3efTrP7DZDdsgbwnLndAg&zoom=1&biw=1600&bih=727

i asked the other people in the server about that and they said everything was fine for them and they didnt see any errors

i logged into another server and saw

as u see alot of errors and pink/purple squares on glass and other staff at the background

is there any solution for this?
thx in advance

edit: i guess its because i dont have counter strike source
but i bought the game so i think i deserve the same gameplay as one who bought gmod and css