[PLEASE HELP]:(Combat arms error:( [HELP PLEASE]

Hello MPGH people.
I got a big problem
Whenever i try to play combat arms. It loads at first then i click "Game Start"
Then it comes up in the bottom right corner and loads the first logo.
And after the logo comes in the middle and it says
"Combat arms is already running, So shutting down client"
Please help!

Edit: I did CTRL + ALT + DELETE on the task manager.
Im virus scanning now
Turned off my computer for the night. Still doesnt work.
Sometimes it works but after when i exit CA it doesn't work for hours!
ANOTHER EDIT:I FOUND 1 VIRUS. THIS MAY BE THE PROBLEM!

Please help!
I hope its the virus that is the problem
Wish me luck
OMG 47 TROJANS! IT DELETED MY C:/ AND CA STILL DONT WORK!
AHH!