About 43 percent of them said they felt vulnerable on their home computers, while 17 percent felt they were vulnerable from viruses and hackers at work.

The survey, conducted by Edelman, a public relations firm, questioned more than one thousand adults nationwide.

American Internet users were warned by Microsoft last month of a new virus attack. On Monday, the new worm, MSBlast, infected at least 7,000 computers in a matter of hours, according to Symantec. Still, security experts said the spread was slowed because the virus program had several flaws.

The survey results indicate that West Coast residents are most likely to feel insecure on their office computers, and the most wealthy and educated feel the most vulnerable on the Net.

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