I've had similar issues with HP Scanner software. If you've got an HP scanner or camera, make sure to install ALL of the software included. (Or uninstall everything but the basic recognition software for a camera.) The "Share Web Folders" (or something similar) will frequently ask to be installed when it's been removed from the desktop.
Next, just to make sure. Please try downloading, installing, updating, then running ALL of the free spyware removal tools from the links below? Run them all to see if the problem is spyware related:
Hi I have windows Xp, and everytime I start it a windows installer window pops up then trys installing something, and then switches to a window which says that I don't have sufficent access to this program please insert CD I don't even know what it is. Then I try canceling it, and it just displays it again. So I have to go into the task manager to end the task. It comes up as instant share device. Can someone help