first check if u hav any cd's in the virtual drive(s), most likely might be the harddrive running on full throttle, or ur fan(s) might be clogged up with dust or especially the heatsink, if so then blow the dust off with a air compressor or one of those cans of air
Yes. I my self have had experiences with sounds like that. shorly thereafter I got a BSoD with the beloved "beginning dump of physical memory" message. Usually there is decent free ware that will tell you the health of you components.