After recently installing a new copy of Kaspersky Internet Security 2010, the problem I encountered was that the product appeared to be disappearing soon after. Three or so attempts have yielded the same outcome - I install it, run the scan it prompts you to, and then it does its masterful disappearing act midway through said scan. Clicking on the desktop icon produces the message, "Windows cannot access the specified device, path, or file. You may not have appropriate permissions to access the item".
Being somewhat computer challenged, I placed the blame solely on the product, although it has since happened with Malwarebytes' Anti-Malware. Also, even though seemingly not there, the products aren't uninstalled.
From what I can gather, the aforementioned message is a recurring problem for many people. After troubleshooting on the back of suggestions for their problems, it seems likely that me and the many don't share the root cause. Simple tips such as altering settings have proved futile.
Anywho, any help is, as ever, appreciated. Sorry about vagueness of the information. I'll be happy to supply further details.