I built my system about 2 months ago. It has the asus prp800 MB p4 2.4c cpu maxtor 160gb radeon 9500 pro and one stick of kingston 512mb pc 2100. It makes lots of griniding noisies lots of the time when I am like trying to winzip something and at the beginning it starts taking longer where it is the black screen with the bar going acrosss. It used to take like 4 times now it takes like 12. Do i need to get another stick of it?