I downloaded a worm into my system, which I got rid of. However, when I boot up I get this message cannot find C:\windows\system32\system32.exe after closing this box everything works fine. Can you help?
This is a remnant of the virus - there should be no system32.exe - the command to load the virus (which is not in itself a virus) is still in your system - though not doing any harm, as it cannot find the virus file to load (hence the message).
Use Start - Run msconfig to go to the list of programs set to start up as the system starts, look for the line that tries to do this load, and untick it.