Thanks for the replies. I've started with Nelviticus' tip one. There are 3 services that show 'automatic', but are not shown as 'started'. They are Automatic LiveUpdate Scheduler, Bonjour Service, and Computer Browser. The first and third show start error 3: system cannot find the path specified. The second starts and stops again. Tip two: Event viewer (application) shows one error: nview info (1) and a warning for EvntAgnt (1003, 1015) that I then clicked on and was told by MS online help that no user action was required. Event viewer (system) shows an error in service control manager (7000), about which MS help online says the following:
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Explanation
Service Control Manager (SCM) could not start the specified service, probably because the service is not configured correctly.
User Action
Do one or all of the following:
Review the error information displayed in the message.
Verify that the service password has not expired.
Verify that the service is in the correct location.
Verify that the service is not infected with a virus.
To display the WIN32_EXIT_CODE error that SCM encountered when trying to start the program, at the command prompt, type
sc query service name
The information displayed can help you troubleshoot possible causes for the error.
If the WIN32_EXIT_CODE is zero, then SCM did not attempt to start the service because the error was detected first.
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I don't really know how to do that (I'm not really a technical user). There is a knowledge base article, that says:
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Method 3: Configure the Service to Use the Built-in System Account
If the service still does not work with the specified user account, configure the service to log on to the built-in system account. To do this, follow these steps: 1. Click Start, click Control Panel, click Performance and Maintenance, and then click Administrative Tools.
2. Double-click Services.
3. In the right pane, right-click the appropriate service, and then click Properties.
4. Click the Log On tab, click Local System account, and then click OK.
NOTE: In most situations, it is not necessary to configure a service to interact with the desktop. You do not need to select the Allow service to interact with desktop check box.
5. Right-click the service, and then click Restart.
6. Quit the Services tool.
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When I checked, the tab 'local system account' was already checked.
If anyone has any suggestions about what to do next, I'd really appreciate it. I guess the problem identified under tip one above 'system cannot find the path specified' is a starting point?