Another method of fixing it is clearing the most recently used documents list by right-clicking on an open area of the Taskbar and choosing Properties/StartMenuPrograms and hitting the clear button.
Some systems get confused, too, when you open executables from the floppy...or try to work from it directly.
When you bring a file to the system...1st copy it to the hard drive...change Windows Explorer to seeing C drive or something else and exit.
Leaving Explorer on a look at the a drive when you close it can cause problems.