Are you sure your computer is virus free? I like this online scanner: Windows Live OneCare safety scanner: Free online tool for PC health and safety. Do the full scan. It'll take a couple hours but it's worth it.

To disable LW from running at startup, open LW and go to Tools>Options>Advanced>System Startup, and uncheck the box and click apply. To uninstall limewire, go to C:\Program Files\LimeWire\Uninstall.exe. Double click it to uninstall LW. I'm not sure about the other two, but check their folder in the Program Files folder. Also try going to Start > All Programs and see if they're listed and if they have the option to uninstall them.

To disable programs from running on startup, you can go to your System Configuration Utility. Go to Start > Run, and type msconfig and click ok. When the utility opens, click on the "Startup" tab and uncheck the programs you don't want to run on startup and click apply > ok > restart. Hope it helps.

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If it ain't broke, fix it till it is!