Programs on your computer access the registry thousands of times per second. This means that the registry gets bloated and fragmented with time, just like hard drives. And of course that affects your PC performance and makes your computer slower.
Most of your computer's components are purely electronic and can only be damaged by electronic means. However, hard disks are subject to both electronic and mechanical stresses. Here's a guide to protecting against hard disk failure.
Most of the time, Windows error messages give you little information or clue as to what the problem is. If you've encountered the defrag error message "Disk defragmenter could not start", here is a list of possible solutions to your problem.
Defrag the Registry to Speed Up Your Computer