Guild Wars 2

I have a problem with my graphics. When i play, the screen is full of patches of broken textures colored blue.
I tried to lower the graphics to the minimum but it it did not help

( i know that i have a bad pc)

System info:

Microsoft Windows 7 Home Premium

Processor: AMD Athlon™ II P320 Dual-Core Processor, 2100 Mhz, 2 Core(s), 2 Logical Processor(s)

Graphics: Ati mobility radeon HD 5470 graphics 512 MG

Please help.

try updating drivers from AMD.com (see Part 1.1)