John Dvorak recently wrote about how poor Windows is at multitasking. For instance, you're writing a Word document while in the background copying a huge file, but your keystrokes don't get priority.
He also complained that Windows is goofy about calculating how long it wil take for that file copy to complete. Windows seems unable to make a reasonable calculation. Its first guess as to time is often way off, and Windows fails to adjust to reality during the copying process.
It's a valid complaint, one that I shared with folks at work. But it's not just a problem with Windows. My colleague Davin Granroth sent me this jewel -- Stuffit on MacOS thinks it'll be centuries before it'll finish decompressing a file.