The main problem that affects many users is that over time your computer becomes very slow even in the most common operations.
The causes that may influence the slowing down of the computer can be a lot, here we show the main and their solution:

Defragment the Hard Disk
The hard disk may be the main issue in the slowing of your computer. Indeed with the passage of time by inserting and deleting file data are not written in sequential order and the computer takes longer to retrieve. Running defragmentation these data are sorted so as to be found more quickly. To run the defragmentation just click the right mouse button on the unit in question (C:) and select the entry Properties, then open the Tools  and click on Run Defrag... The process may at some time this depends on the status of your hard disk and its size.

Clean the records windows
Each program includes keys installed on the Windows registry, even after its removal a few keys are not erased. This over time can fill the register unnecessarily slowing down the whole system if not making it go in error. So programs used regularly for the possible cleaning of the register (see the appropriate section of the site for some advice on what program to use).

Viruses and Spyware
Needless to say that the various viruses, adware and spyware slowing down your PC. So a good rule is that each pc has a good antivirus and a firewall but soppratutto that scans are performed periodically throughout the system. In the relevant section of the website you will find advice on major anti-virus and firewall free.

Maintenance
Finally some rules to keep in your pc:

• delete the unnecessary programs and disabled the services that you need
• delete temporary files regularly for windows, internet explorer, etc..