Beginning yesterday, everything I do in Excel takes forever -- or the
application stops entirely. VBA modules still run normally (fast), but
every macro and everything I do directly takes a very long time.

I uninstalled and reinstalled Microsoft Office 2000 in an attempt to
correct the problem -- no success.

No changes were made to applications. And the same application runs
normally on another computer.

(Macros turn off screen updating and autocalculation).

Any ideas what could cause this system to behave so strangely?

Thanks.