Yo wusup all. i am new to these forumz

. i been playin mohaa since the demo. but since i installed Spearhead i am havin these lil grafik issues .... i am seeing lil squares on the floor. they only appear when i shoot sumone or i get shot there. they keeep flinchin with every move i make. it is really disturbing . they look like grey square with a white linin aroudn it ... PLZ ANY HELP !! my pc specs are
*plz dunt laugh*
p4 1.8ghz
384 mb ram
win xp pro
nvidia geforce 4
plz ANY HELP WOULD BE GREAT!!!! this makes me wanna bigzooka: my pc.
thx in advance