
This screenshot was done shortly after startup, especially the "searchindexer" will grow in memory imprint by time (current value is 32.380K here). After leaving the computer idle for some minutes "searchfilterhost" and "searchprotocolhost" are removed from memory, but as soon as you save any document (like this image) they will startup again. Here is a screenshot when running idle, have a look at Yahoo's memory imprint underlines in green.

Microsoft's Windows Desktop Search can prohibit other search tools to run properly. Google had some reported problems dealing with Microsoft over this, but that was connected to Vista's indexing slowing down Google Search considerably as far as I remember. Nevertheless there are obvious stability problems when running a third-party search application in conjunction with Windows Desktop Search. This is what happened when saving a PNG to the Desktop with both WDS and Yahoo running, Explorer and WindowsSearch both crashed!

In general I wouldn't trust WDS to be running on XP while I'm doing a live-set.