Windows KB891711 component has altered Windows system files.

I ran Dr Watson and this is the error message I receive. The original problem
is that my Command Antivirus updates no longer open since my latest Windows
ME update. The message is "This patch package could not be opened. Verify
that the patch package exists and that you can access it, or contact the
application vendor to verify that this is a valid Windows installer patch
package." The computer searches for the update on my floppy drive rather than
on the hard drive.