[help] windows start on login problem

ok. the problem started the day before yesterday. i rebooted the computer, and noticed that my mouse and keyboard software didn't load when i logged in. checked the processes list. and my antivirus, ipodservice, ituneshelper, mouse, keyboard, and probably others i didn't remember, didn't load. all the software is still on the drive.. but they just don't load like they are suppost to. i checked the msconfig program, and the services are still selected to load, in the ipod case, and some of the antivirus. but, the "startup" tab was missing like.. 8 programs. supposively no one but my 2 brothers was on the computer, and all they did was run diablo II. antivirus has been coming up completely clean. so i don't know whats going on. any of you have any ideas what could have happened, or how to fix it?

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