problem to get in the arcade page

the problem is when i click on the arcade link ( or type it on the address bar) it show up a download window to download the file arcade.php instead of get in to the arcade page. What should i do??? i really need it so plz answer me...My members are being crazy :erm::erm:

[EmpireZ]

Make sure you unzip the files locally then re-upload them through ftp.

[xixxon]

i leave it there for like 1 or 2 week untill that problem...and then when i tried again, it working good and i began to add more games. When i add up to like 10 more games, then i met that problem again...it shows a download box when i'm browsing by firefox and it shows ''page not found '' when i'm using Internet Explorer. I thought it was my comp's problem but when i tried by the other comp, it still the same. I re-up it like 3 or 4 times and i overwrite it by the arcade.php of the add on '' user playing'' but it still hav that prob