How does file fragmentation affect hard drive space?

Do optical mice need to be cleaned?  If so, how should they be cleaned if there's no moving ball?

I use AOL and experience Fuzzy, Blurry, and Blocky images.

   
How do I run Disk Defragmentor?

   
   
   
   
   
   
   
   
   
   
   

 

 

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