When in the campaign missions, particularly the ground attack missions, i am getting a lot of chop...i have a pentium 4, 512MB of Ram,128mg video card with XP Pro.....my refresh rate on the monitor is set to 60HZ....in game, my details are at 640x480...all the options are turned to low....seems like i have problems when a lot of aircraft are in the air with me on a strike...also when in mission i am having a hard time picking up the sams...i hear the warnings, both tone and verbal, but i am failing to locate the sam...using the RAW gear i know the direction the sam launched from , but i am getting the old 6 blown off..Thanks..enjoying this game...also, if it matters, i have installed all the updates .......The reason i turned the resolution so low on the grapics is to maybe speed things up...No joy there....