http://blogs.systweak.com - Any windows computer only uses 5% of total power of CPU. You can fix 100% cpu usage by following methods-
Check Background Processes
It Can be a Malicious Virus
Hardware Problems
This happens when a program faces an unexpected error. If the programs running are using CPU nearly 100%, it will have to free up processing power for different processes, which in turn, will make your computer slow.
Malware or virus are infections that can damage the computer and steal data and other sensitive information.