My friend was trying to install Kaspersky Anti Virus on a computer with a Windows Vista Operating system. But the installation would not proceed because it thought that McAfee anti virus was installed on the machine. My friend told me that McAfee was pre installed on the computer she bought, but she recently removed it from the Add and Remove Programs in the control panel.
The problem: This scenario is very similar to my previous "Photoshop CS3" installation problem. 9 out of 10 times, installation of software fails because previously installed software has left behind "junk" in the windows registry.
The solution in general: If you know enough about the windows registry, you will be able to go in there and delete install info left behind by uninstalled software. To be honest, I never felt comfortable deleting entries in the registry because it can cause windows to malfunction. Always remember to back up your registry before doing manual changes.
The easiest way to solve such a problem is to search the Internet for a cleanup utility. Preferably from the actual manufacturer of the unwanted software. For example, last time we found a cleanup utility from Adobe to remove unwanted CS3 values in the windows registry.
The actual solution: There is a McAfee cleanup tool called MCPR.exe. After uninstalling McAfee from the Add and Remove programs, download this tool and run it. After a restart of your computer, you should be able to install Kaspersky.
Additional information: Because two different anti-virus software can't coexist, you will most likely run into this problem if you even had a different kind anti virus software previously installed. Here are the other remove tools from the major anti virus vendors.
McAfee
Norton
AVG
Kaspersky: I could not find an official remove tool. I found some third party ones, but try them at your own risk (I will not post a link to them.)
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