There are many handy tips that you need to follow in regular in daily life to optimize the PC performance as well as expand PC lifespan.
• Scan your system with good antivirus program to avoid virus/ malware damages
• Clean the temporary file by making use of Disk Cleanup > Go to Start and type Disk Cleanup. This will analyze and clean the system. Press Windows key > type %temp% > hit Enter
• Change the startup
• Uninstall unwanted program
• Keep your Windows system updated

The entire information is taken from - http://fixpcerrors.wixsite.com/increase-laptop-life