computer hangs up

Hello guys i have newly installed open suse11.0 ,but i am having a problem with it
every time i login ,or drag any of the opened folders my system hangsup,several yellow lines appears and computer stops working .
please suggest something for it.
my pc sonfig is
core2duo 2.66
2gb ram
nvidia card 512 geforce8400gs

every time i login

my system hangsup

This would prevent you from doing the latter:

drag any of the opened folders

Do you have desktop effects, have the nVidia driver installed, use gnome or kde3/4?