Why is my computer so slow all of a sudden?

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You can fix your problems by paying attention to the methods below:
1. Diligently patch your system
As we all know problems will occur if there are some system bugs on the computer as sometimes they will allow the hackers to break into your system & spy out data and violate your privacy. So do remember to download and install all available system patches. This helps to timely correct some bugs and enhance computer performance, avoiding the coming of some unexpected computer problems.

2. Regularly run anti-virus program
If a computer is infected by a virus, lots of resources will be taken up to greatly slow down computer performance. What is more, the virus are able to change PC settings, and even give outside parties control over the computer, which will eventually result in different kinds of computer errors. So to optimize computer performance, it is highly recommended that you can install an anti-virus program and firewall to protect your computer from attacking from time and time again. But to always ensure the up-to-date virus database, it is needed for you to update it duly.

3. Timely defragment computer hard disk
Lots of computer users have never run a disk defragmentation during the lifetime of the computer, thinking that it means nothing to the optimize PC performance. But it is a true fact that, a simple disk defragment plays a very important role in fixing computer problems as this process helps to reassemble all parts of a same content to make them stay close together. In this way, it helps to reduce the movement of the hard disk head and speed up the data access effectively. So if wanting to optimize computer performance, do not ignore to run the Windows built-in Disk Defragmenter utility regularly!