He said it short-circuited key software programs he counts on: Quicken for balancing his checkbook, Lotus Notes e-mail and a networking program that connects his home to the office. His Sony camcorder also doesn't communicate with the PC properly.
"Basically they don't work," said Daoud, a computer industry analyst with market research firm IDC.
Such problems are part of the normal growing pains that come with every major upgrade to the Windows operating system.
To ease those pains, some consumers are seeking out machines equipped with the more compatible Windows XP. That's prompted some PC makers and retailers to give the older operating system more room in their product lines.
Hewlett-Packard and Dell recently started selling XP machines on their Web sites. Lenovo Group and Toshiba also offer similarly equipped machines.