comp running slow - help please

hi im running a intel celeron 2.60ghz processor with 256 mb of ram, a 80gb hd which is only 22gb full,
but my comp runs really slow, not lookin 2 pin point the problem as im sure this is pretty tricky but help on speedin it up wud b good please!
thanks ash

You would need to clean your harddisk and defragment it. I use Ashampoo Winoptimizer 3 for this.