TIANJIN, Oct. 25 (Xinhua) -- China's anti-virus authorities on Sunday warned computer users to guard against mutation of Hack_Kido computer virus, which could prevent users from downloading operation system loophole patches.

    The virus would monitor the users' on-line browsing and close any web-site related with the Microsoft, preventing users from getting any help from the Microsoft web-sites, according to the Tianjin-based National Computer Virus Emergency Response Center.

    Experts suggested computer users update their anti-virus software and use the real-time computer virus monitoring function whenever they surf the Internet.