Essentially, a slow computer has an increased demand on resources. Over time we add: music, games, pictures, MOVIES!; and these begin to use up the finite resources of the computer. Before long, there are too many processes, too little RAM and Disk Space, and a bloated registry. Later because of this ongoing process you get hard time/delay accessing your Documents, pictures, term papers, music, financial data, email, bookmarks, etc.
There are several common reasons because of which you get a slower computer performance:-
1. Spies are watching. Spyware is a small program which records information about your internet activity and relays it back to thieves. Spyware will impede PC performance considerably. A sudden decrease in performance could indicate a malware infection.
"If your PC is slower than normal ..., you may have spyware." - MICROSOFT
"Malware is the #1 cause of Slow Computer Syndrome."

2. Virus infection. These are small programs, using resources on YOUR computer, which you never asked for, and make computer really slow! Keep antivirus software up to date.
3. System breach. If you don't already have a firewall or don't think you need one you may want to review this step. Your computer could be sending and receiving unauthorized data. Do not be a spammer's zombie!
4. Unused Programs. Programs you do not use or do not need, require space on your hard drives, and in memory - making computer run slow, and possibly delay startup and shutdown.
5. Wasted space. Remove temporary and unnecessary files from your hard drive. Freeing up operating space can speed up your PC.
6. Low Memory. Having enough memory can make the difference in speed. Eg., Windows XP runs very well with 2Gig or more, and well enough for most people with 1G, but a PC runs slower with less. Vista needs more. Adding memory can be the least expensive and yet one of the most significant ways to speed up computer.
7. Disk Errors. Your PC spends much time reading and writing data to the hard drives. Low performance can be caused by badly arranged or erroneous data on your hard disk.
There are several other reasons why your computer gets slower day by day:-
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