There are many factors that can affect computer rebooting. The first being, virus infections. Very severe virus infections affect a computer systems performance. If the virus is not coded in a professional manner (what is often the case) then it could definitely affect the system negatively. The virus tries to spread and makes copies of itself or adds a code to the data inside the computer. Viruses like Conficker are more advanced than others which means a rebooting problem when this virus gets in to the system is rarer.
The other factor in regards to computer rebooting has to do with the hardware. There is a fault that happens very frequently having to do with the hardware and this problem is even more frequent than the virus infections themselves. This problem is a hard drive fault. It is very rare to see a hard drive that is 4 years old and operates normally. If it does run fine, then most likely it is an IDE hard drive. Even if the hard drive does not show any signs of faults inside, a variety of different processes could be taking place. One of these processes is Error Correction. Error Correction means that the hard drive spends more time retrieving data from the disk.
The very big number that is shown above are the times that the hard drive has used ECC (Error Correction Code) to correct data that has been read from the disk. The bigger the number, the slower the hard disk transfers the data to the motherboard, and the more time the whole system takes to respond.
Very frequently, computers display a message saying that a file cannot be found or something similar. Often this is caused by a faulty hard drive or in other words, a faulty disk surface. This can also be caused by a virus, but this is very rare.
A virus is able to make the right partition inactive or change something in the registry. Viruses deleting files is very rare.
The memory amount will affect the computer rebooting speed. The bigger the memory, the faster it reboots. Also, the faster the processor, the faster it reboots.
Faulty hard drives connected to the USB port through USB adapters will sometimes confuse Windows. Especially, when the hard drive can’t read data from the system area, it will look like Windows has changed. Although, after some time of a freezing operating system, it will return to the normal operation. This freeze is simply caused by a faulty hard disk that has problems reading data from the disk.
The operating system mounts the hard drive and cannot properly un-mount it afterward and this seems to affect some of the processes. These processes causes the system to not restart or shut down at all and there is no need to reset it. Do not worry. After a reset or if you restart the system, the computer will function as normal.
When a computer is overheating, it can cut off during the reboot or not start up at all after the shut down. This is because, during the startup and shutdown, the CPU processes a lot of data and the CPU gets very hot.
As is repeated many times on this site already, system cleaning once a year is highly recommended.
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