Many software firms have built up their businesses solely on the back of helping consumers remove virus from their computer's, specializing in the protection, prevention and cure of all manor of computer based afflictions.
Still, the underground of malicious and mischievous programmers and hackers will always be finding ways around the securities imposed by modern anti virus software, and thus there are always vulnerabilities that some clever person can take advantage of.
Not only is it imperative to think about means to prevent any sort of computer infection, it is also wise to look into different ways to get rid of a stubborn and hard to remove virus from your system.
Some virus have been specifically designed to work their way around the most popular computer security suites,and an infection from such a virus would render your anti virus software useless.
When this happens, all too often the infection is left unchecked until the damage is already done.
This is a primary reason why you should always keep your anti virus database updated, so you wont be left so vulnerable to newer threats.
If you do happen to find yourself with a hard to remove virus that your software cannot deal with, then it is time to try and manually remove it.
Often the hardest part of the diagnosis and repair is to identify the actual virus.
If your lucky, your AV software will find it, but it may not know how to remove this stubborn virus.
If you're unlucky, you could be infected with a virus that your AV doesn't even recognize, although most modern anti virus bundles can identify suspicious files as well as definite infections.
Manual virus removal isn't always as hard as it may sound.
Usually you'll have at least one suspicious file picked up by your anti virus program, and this is the starting point.
The best anti virus software's will usually identify and mark the files that it cannot dispose of, and then allow you to log into your windows system via safe mode to delete the files permanently.
Manual removal can be harder, obviously, but with a good program to guide you along the way often the hardest part is already done for you.
Sometimes you will be required to identify associated files that your anti virus didn't discover.
As long as you have a good software though, even this isn't too difficult.
Browsing through the system folder with the display settings enabled to show information lets you find the dates any files first appeared on your PC.
If you have found one stubborn file, but your AV cannot find the rest of the associated files, the date is a good marker.
In the absolute worst of cases a virus may have attached itself to several important Windows system files.
Unfortunately if you happen to have a severe case of spyware, adware or malicious virus on your PC it may be necessary to reformat your harddrive and reinstall windows.
However, this is the worst case scenario, and usually only happens to those who have taken no precautions and allowed infections to amass.
When it comes to computer infections, even with the most hard to remove virus, the process for removal is generally similar.
Depending on the quality of your anti virus software will usually determine the amount of work involved on your behalf in the diagnosis and repair of any infections.