Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to keep your computer fast, clean, safe and good looking [title] Make sure that your computer hard drive is clean. [step] Download a software called cleaner or tuneup utilities. It will help keep your computer a lot cleaner.

Ending1: [title] Don't download software from just any website. [step] Make sure that the website is trusted, and even if you do download something--and find it useless--make sure you delete it from your computer. Ending2: Check inside the drive to make sure nothing is missing, and that there are no large pieces of bad-smelling goo hiding in it. You might need to replace your anti-virus, etc. Ending3: If your hard drive has a tiny bit of dust mites (anyway, you probably need windows os to protect your hard drive), grind off any dust before cleaning the hard drive and remove the dust with a wet sponge. Afterwards wipe down with a clean, soft microfiber cloth. Ending4: Anything that could be hazardous, such as viruses, was soon removed from your hard drive. [title] Do not install quick access on your operating system.

Answer format: ending1/ending2/ending3/ending4