Hi, sorry to hear of the problems with your machine
Taking them in order:
The first two are usually associated with McAfee products…however it is not unknown for malware to "adopt" legitimate file names so a complete virus and spyware scan with your updated resident software protection products is recommended.
McAfee (and other products) do sometimes leave remnants of themselves behind when they have been uninstalled and this is particularly the case if the user forgot to stop any of the software's running processes before carrying out the uninstall.
The ycommon.exe is usually associated with the Yahoo browser and can get left behind if it was running at the time the uninstall was performed. the same remarks apply to the Google toolbar.
One way of dealing with the ycommon.exe is to reinstall the application so it is fully operational, reboot, and then after making sure it is not running and is completely closed down ..uninstall it and then reboot.
The same procedure could also be used for the Google toolbar…but please only do one thing at a time, create a System Restore point before you initiate each procedure and don't forget the reboot and to stop the application from running before you uninstall
Regards
paws
The McAfee remover worked like a charm. I tried installing and then uninstalling the google toobar, and I think that worked too. I haven't messed with the Yahoo thing, because the running process hasn't showed up again, so I'm not going to worry about it. Thanks for all the help! :-)