In some optical mouse are working despite being off the computer, the more easy and safe way to turn off the mouse is to go to the back of the Cabinet or CPU and on the side of the power source (near a large fan) there is a switch that says I-o must be left o since it switches off the computer, if you want to turn it back on the computer you have to return to the back of the Cabinet or CPU and put switch to I to turn on the computer already that if not do you not be come on. 11. Keep clean and ordered the hard drive for files that are not used, temporary, cookies, history, a trash clean, improving the team’s performance there are programs that clean easily these files that we don’t see or use as CCleaner and Windows also has a tool that cleans these files should go home > all programs > Accessories > system tools > disk space cleanup. It is also important that from time to time you should defragment your hard disk since it compresses and sorts old files and improving the performance of the hard disk so that it is necessary to go start > all programs > Accessories > system tools > the Disk Defragmenter, that window must choose the hard drive we will defragment and then go there scan button will tell you Windows if you need to defragment it or not, if you must defragment you have to wait a long time to make it properly, since the two actions are a little delayed in clean and sort by that have to do it when they have time. 12. Keep clean your computer from viruses, Trojans, worms and how much code malicious walks out there, improves performance of the equipment so have to use, scan and keep programs updated Trojan antivirus, antispyware and anti or review team once a week at least, a good antivirus is not enough at least must have an anti-spyware on your Pc I have two that are free and very good one is called Spybot Search and Destroy (which revises the) robots spies who go online) and Lavasoft Ad-ware is staff if you want to know more about these programs and download them visit this site that give you all the necessary information of protection on your computer.