1.  At the request of a client, Websense can prevent office computers from accessing certain categories of Web sites.

2.  Instead, it involved another program, Norton CrashGuard, which prevents computers from breaking down because of software problems.

3.  Microsoft then told computer makers they could strip out all the Internet Explorer files, which would prevent the computer from working properly.

4.  Of course, it may not be possible to prevent the computers from being used in clandestine fashion for military purposes.

5.  One hope is that some yet-to-be-discovered material capable of removing excess heat could prevent molecular computers from disintegrating into smoldering blobs.

6.  The average user is essentially clueless about how to prevent his computer from being taken over, so assigning liability to him would be pointless.

7.  Most listed companies in Japan are still unprepared to prevent their computers from failing when the millennium computer bug strikes, the Tokyo Stock Exchange said Thursday.