'''Some classic reasons a computer slows down.'''
1. It's possible that your computer may have so many background programs running that there is not enough main memory to run your main programs.
2. Your hard drive could be too full of data to function efficiently.
3. Your computer could have a fragmented hard drive.
4. If you have 256 MB of free system memory or less, or you like to play games, you may not have enough system memory to run your software efficiently.
5. You could have old or conflicting Windows device drivers.
Let me know if you have any other query.
6. As each new Windows program is installed and uninstalled, it leaves behind parts of itself that can slow down or crash your computer.
7. Your computer could be full of adware, spyware, viruses, or trojans.