damsel in distress needs help with her windows xp laptop....

im not very clued up on computers so i need help.....
well..
my computer became very slow.....
then the next time i started it up it came up with a FAT32 diskcheck...
and took 7 HOURS!!! to complete replacing all sorts of bad clusters and didnt help in the slightest because it now does the exact same thing everytime i start up....

and i thought it might be because my computer was too full.
so i have removed some programs (the proper way)
and did a disk clean up..

i tried to do a defrag but the space left is 11% and defrag wont work unless i have 15% free or somethin.

im really confused and if anybody could tell me whats going on, or why my computer is so full or why this dickcheck takes so long i will be so gratefull.

thank you very much
x