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Take Backup every now and then in a DVD-R/W or in an external USB Drive or in an mini Hard Disc.

Keep your computer with installing top most antivirus and make it sure that it is currently updated.

When you install a software be sure that it make danger to your system or check with the antivirus once.

Clean your system atleast once a week with registry cleaner or some free registry cleaner

Also make sure to delete all the temporary files. click windows+R then type %temp% and clean all the unnecessary files and folders.