A virus is playing havoc with the municipal court operations in Houston.

The court system had to close down Friday afternoon after a computer virus affected access to data on court cases. Courtroom operations aren’t expected to be back in business before Thursday morning.

People can pay fines and conduct other court business, but judges will not call dockets. Those with court dates for misdemeanor cases will be notified by mail of their new dates.

The virus hit 475 of the city’s 16,000 computers and infected part of Microsoft Windows that handles the login process.

Gwendolyn Goins, spokeswoman for the court system, says she does not know how many cases have been affected. She said there’s no evidence the virus was released deliberately.

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