I am a big pro when it comes to benefiting from free software. I must tell you that there is loads of very efficient free software available online and the free PC error scan programs are a very useful category among them.
Many people argue that the PC error scans which come for free are not good as the premium or the paid versions. I agree. But my point is that most of the PCs at homes or even at offices are infected enough to be cleaned by the premium version. I am of the view that the premium versions should be used only if the PC is too infected or it contains information that is too sensitive. The registry of a computer is a highly sensitive and an equally important component. Over the passage of time the registry is filled with many kinds of obsolete files and good for nothing dormant software. For that reason the computer becomes extremely slow. The scan program raises all such issues. Sometimes the information is being used for criminal purposes and at other times these hackers ask the victim(s) for a handsome amount of money as ransom to get their information back. Never ever install a program from a site which looks suspicious to you in any way. Currently there are many sorts of junk emails circulating in the cyber world which contain a link claiming to be the link to a free PC scanning program. Once you click on the link the hacker will get immediate and full access to your PC. It wont matter if you remain online or get offline.
A very grave issue with the free PC error scan programs is they might not be able to detect some very malicious software. And though I am a strong advocate of not spending money on software, I never ever recommend free programs for PCs with highly sensitive information. There are some free PC error scan programs available online whose free versions also work very efficiently.

Of all the Free PC Error Scan software that I have come across, I have found the Spyzooka to be the best of the all. Download its free version and enjoy a safe computer. .