World Of Warcraft : Failed to find a suitable display device. Exiting Program

Recently, I wanted to play (WOW). So, I installed it, and when i clicked "play," it says this error message.

"Failed to find a suitable display device. Exiting Program"

I don't know what is wrong. I have played WOW on this computer, but a few months ago, i got a nasty virus, and had to completely restart my computer (i did lose all of my files and data on my computer.)

I'm not that computer smart, so this is all of the info i found out about my computer.

System:
-Microsoft Win xp
-Home Edition
-Version 2002
-Service Pack 1

Computer:
-Intel(R)
Pentium(R) 4 CPU 2.80GHz
-2.79 GHz
-1.49 GB of RAM

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Try updating DirectX.
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