Guild wars 2 is going to be very pc friendly, here are the minimum specs:if you have these you can play with high settings you might turn off shadows and put water reflections on medium, but you should be fine....
Windows® XP Service Pack 2 or better • Intel® Core 2 Duo 2.0 GHz, Core i3, AMD Athlon 64 X2, or better • 2 GB RAM • NVIDIA® GeForce® 7800, ATI X1800, Intel HD 3000, or better (256MB of video RAM and shader model 3.0 or better) • 25 GB available HDD space • Broadband Internet connection • Keyboard and mouse