Cannot get new updates unless I reboot

[davetheengineer]

Hello friends,
I cannot get new updates unless I reboot my computer. When I click on "Search for new updates" it goes out to look for the information and comes back with the dialog box, "No new updates available". After a week or so, I become suspicious and reboot. After rebooting, I get my updates with no problems.
Everything else works fine. My wife and I have the same computers with the same software and she has no problems getting new updates.
Any ideas?
Thanks,
Holiness David