Oracle has issued an emergency update to the widely-used Java web software over the weekend, but experts say it still contains security flaws.
Last week the US government advised users to disable it because of a bug that leaves computers vulnerable to being hacked.
Security specialists claim the fix has not done enough to make PCs completely secure.
Oracle says that more than one billion people use Java, and some games like Minecraft are built around it.
The bugs can make a computer open to infection by viruses. Last year net security specialist Kaspersky said that 50% of hacks carried out by seeking out software bugs were done via Java.
Oracle says the vulnerability applies to the latest version of the software, Java 7. It has declined to comment.
Java is a programming language that enables software to run on many operating systems. It is also installable on web browsers.
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