Posted 07 July 2011 - 09:56 PM
PUM means potentially unwanted modification. Malwarebytes will detect certain registry key modifications but it cannot determine if they were made intentionally by the user or by malware. Therefore, Malwarebytes flags these changes and offers a way to correct them for novice users. The program developers assume that advanced users know if they disabled such keys, understand the detection and can safely add it to the ignore list. You also have the option to disable all PUM detections.
There are various tweaking programs which can keep Search from appearing in the Start Menu. You can even perform that action in Windows by right-clicking Start > select Properties > Customize... under the Start Menu tab > Advanced tab > Start menu items, uncheck the box "Search" and click Ok twice. To add it back to the Start Menu, you repeat those steps but this time check "Search".
If a scan is showing this entry and there no other signs of infection, then having Malwarebytes add them to the Ignore list (by right-clicking) will prevent the detections from showing in future scans. If you are experiencing symptoms of malware and did not disable the entry yourself, then further investigation is warranted as there is no way to specifically tell how or by what something became disabled. There are infections that disable certain Start menu items so that's why Malwarebytes is detecting that setting and letting you know it is disabled.
Usually when your machine is infected with malware, you will experience other signs and symptoms (pop-up alerts, slow computer, poor performance, browser redirects, etc) that indicate something is wrong.
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