A hanging computer can be an irritating interruption when you are in the middle of some important work. Moreover, you can also lose some important documents if this problem occurs frequently. Install a registry cleaner tool that scans through the documents in your computer and find out the root cause of the problem. After tracking the problem, the tool also fixes the problem for a long-term result. There can be three reasons why a computer hangs-virus attack, overheating of the processor or the motherboard that is kept cool by the cooling fans and a faulty disk drive. So, check whether the fan in the CPU is malfunctioning or not. Secondly, run a disk scan to check whether there is any fault with it. You might be required to replace the hard disc if there are any irreparable sections in it.