Note Zombie thread. :hypnotized:
Good point, but I will respond with updated information. Here is current thinking, as of 28 March 2019:
Windows XP is dead. If you are online and using Windows XP, your computer is infected and will become re-infected over and over, even if you think you "cleaned" it.
Windows 7 will be dead in nine months. The same thing that is happening to Windows XP computers will start happening to Windows 7 computers. There will be an unending string of infections, viruses, and malware. Now is the time to get ready to update. For some, it is too late already. Get moving!
Background:
With every monthly security update, Microsoft "informs" the bad hackers where to look to attack Windows XP computers. When Microsoft releases fixes for security bugs in newer versions of Windows, a surprising percentage of those bugs affect Windows XP, too. The same thing is about to happen to Windows 7. As of this writing, 1/3 of all Windows computers run Windows 7 (February 2019).
Those anti-virus, anti-malware, and "cleanup" tools are not as helpful as the hype would lead you to believe. I suppose that most of the well-known ones are better than nothing, but others are ineffective, and some are harmful. They are no substitute for a properly updated current operating system. The people who rely on them to "clean" their obsolete systems are taking shortcuts and doing themselves a disservice. You can't keep running a car forever. Additives and liquid sealers may help you limp along, but eventually you must rebuild or replace the engine.
WHAT YOU SHOULD DO:
If you are running Windows XP or Windows 7, then plan your upgrade to Windows 10. Start now. You are out of time.
On 11 February 2020, bad hackers will begin scanning the internet for vulnerable Windows 7 computers. That's the day when Microsoft will release updates for newer versions of Windows, but not Windows 7. You can bet that some of those fixes affect Windows 7, which won't get fixed. Be ready.