Hello, today i tried to play AvA (alliance of valliant arms) and it was so laggy i coulden't even enter the channel and it was extremely hard to even move the mouse around and i wonder why this is happeing, my computer meets the minimum requirements

Allaince of Valliant Arms Minimum Requirements
OS: Windows XP / Vista / 2000
CPU: Intel Pentium 4 2.4 Ghz
RAM: 1024 MB (1GB Ram)
HDD: 1.6 GB
Graphics Card: Nvidia Geforce 6600 or Radeon X600/X1600 GPU with Shader Model 2 (Required

My Computer
OS: Windows XP
CPU: Intel Pentium 4 2.66 GHz
Ram: 1022
HDD: 14 GB left
Graphics Card : Nvidia Geforce 5200 (128 mb)

Thanks.