Slow....slow....slow

My pcs rather slow of late. I dont know why leh. Is it time to defragment it already? I remembered doing that not too long ago. Must we do it regularly? My pages is taking ages to load. Especially those with lots of images.

Many of my programs are also taking a tad longer than usual just to complete something. OOhhh... i hate to defragment this thing. Takes a zillion hours to finish. Are there any programs out there that will make this machine work faster?