Need help with EtrePro report on late 2009 macbook pro

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Failing hard drive - This computer has a hard drive that appears to be failing.

This is your main issue. Your hard drive is failing! Make sure you have a backup ASAP (see below). Otherwise, you will loose all your data.

No Time Machine backup - Time Machine backup not found.

It appears that you do not have a Time Machine backup. If this is the case, you should create one. To start, you need an external hard drive. Here’s an excellent one sold by Apple: G-Technology 4TB G-DRIVE mobile USB-C Portable Hard Drive - Apple. You can then follow the steps in this Apple Support article to setup your Time Machine backup: Back up your Mac with Time Machine - Apple Support.

Adware - Adware detected.

Use the free Malwarebytes for Mac to remove adware.

/Applications/DrCleaner.app/

Delete DrCleaner.app. Mac computers do not need any sort of anti-virus, cleaners, VPNs, etc. The only thing they are good at is creating false marketing promises and taking consumers' money. They are all scams. In fact, anti-virus and other cleaners cause performance issues, security issues, and make macOS appear buggy. Your Mac is far worse with these types of Apps installed

Mac computers have protection built-in, which is the best protection for your Mac. For specifics on macOS Security, see: macOS - Security - Apple and Protecting against malware in macOS - Apple Support. Mac computers also have built-in storage recommendations: Optimize storage space on your Mac - Apple Support. You can even use the built-in macOS Firewall: Block connections to your Mac with a firewall - Apple Support. Other than that, all you should do is restart your Mac approximately once a week and keep macOS up to date: Update macOS on Mac - Apple Support. 

However, should you ever get adware or malware on your Mac, the only tool that should be used to remove it is the free Malwarebytes for Mac. This App is the only exception to the general rule that no anti-virus, anti-malware, etc. should be used.

Moving Forward

Due to the number of issues, such as a failing battery, failing hard drive, etc., and your Mac is obsolete and very outdated, and therefore cannot be repaired, I would suggest that you replace this Mac for a new one.

Here is Apple's current Mac product lineup: Mac - Apple.

Apple also sells refurbished Mac computers: Certified Refurbished Products - Apple.

When you get your new Mac, do NOT restore from your Time Machine backup during Setup Assistant! That will restore the software issues with this Mac, such as the malware, the parts of the malware MacKeeper, and more. Rather, after you set up your new Mac, inherit your Time Machine backup (If your new Mac inherits your backup history - Apple Support) and restore just your files to the right locations: Restore items backed up with Time Machine on Mac - Apple Support.

Also, since you seem to have lots of adware on this Mac, on your new Mac, you may want to perform a scan with Malwarebytes for Mac occasionally to make sure you are clean.

Jack