The original copies of Windows are not entirely flawless, though, and may malfunction in some way after a couple of years since the system was installed. As for the latter, no one knows for sure what changes to the original system are made by their authors. It’s very likely that you will face the problem if you have a system without Service Packs installed, or one of the custom “homemade” builds of Windows. If your Windows copy is damaged and works incorrectly, it may result in the malfunction of the Windows Installer service. Where do the leftovers come from? First of all, they may appear because of the operating system errors.

For those who speak literary English, we will paraphrase it as “system files and registry keys remaining after a previously installed Kaspersky Lab product had been removed.” If a previous version of a product was not uninstalled completely, you may be unable to install a newer version. Here in Kaspersky Lab Technical Support, we call it “leftovers”.

We have already examined what happens when the system requirements are not observed, but there is another common reason why installation may fail. If you have been following our blog for a while, you know something about what problems you may encounter installing our products and how to solve them.

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