We use laptops,no matter Acer Aspire One  or HP Pavilion DV6000 ,midnight sometimes suddenly become very slow , high-speed laptop CPU fan constantly running . Opened a "voluntary control device " found that 100% of CPU constantly running , and fragmented user has not turned in what order , is occupied by an unknown fractional order 100% CPU resources . CPU use 100% of the situation, it is definitely slow running computer , and even a crash form . Here I summarize some rare myself occupied 100% CPU reason , but also give yourself some treatment methods.

Piecemeal or bad virus code
General order of viruses and Trojans will take up a lot of CPU resources , if your machine is infected with a virus or trojan order , CPU will be occupied as well as an instant 100% . About the condition , the initiative themselves to kill the virus software with viruses and Trojan liquidation order , if the antivirus software can not eliminate the virus , their only reinstall fragmented .
IE plug-ins or web page code reader operation fault
Opened too many flash website , web TV page will occupy a small amount of HP Pavilion ZV6000 for example ,its CPU resources to turn the page if the fault code , and can indirectly lead to the disintegration of IE reader , showing CPU 100% operational , and even crash . Initiative itself was not closed as far as possible the use of the Web , do not turn too many flash website at the same time ; if IE reader disintegration , can the re- launch IE .
Incurred by the use of software fault controlled disintegration
In our ordinary use of Thunder , BT, office, large graphics software , video player will use the software properly controlled disintegration , HP Pavilion ZX6000  for example : Download the software and firewall conflict , opened a fault with the office file, video playback has been protected video files And so on . These conditions will cause the disintegration of using the software , CPU 100% occupied . Even if we have to switch off the desktop to use the order of hours , the computer is very slow , CPU is occupied 100%. The hours we are able to turn over " control device obligation " to find occupy CPU 100% of the process , then the process can end up .
Antivirus and firewall software
Local anti-virus and firewall software because it is time monitoring features , lead to high CPU- resources . Is that you can take a close look , they also take up more memory resources. I do not even remove them to suspend the initiative , but the best programs so that their work tasks , CPU- to maximize their efforts . Also, try to choose those who take up CPU and memory use less anti-virus and firewall software.
Unreasonable driving sequence
Installed hard drive in order unreasonable , but also lead to a high degree of occupation to one of the HP Pavilion DV9000  CPU resources . Initiative as far as possible through Microsoft certified device driver in order , perhaps the official notebook device driver provided by the order .
These conditions will lead to CPU 100% occupied , and even crash . These are just a few rare conditions . However, you only need to incur CPU 100% cf operation over the origins and treatment , confidence in the use of laptop would you be to assist the process .