Microsoft has reissued a patch for the security update that caused blue screens on many computers. The new patch comes 10 days after MS told users to uninstall the previous patch.

Tracey Pretorius, director of Microsoft Trustworthy Computing, said: "This month we had our first roll out with additional non-security updates. A small number of customers experienced problems with a few of the updates."

"As soon as we became aware of some problems, we began a review and then immediately pulled the problematic updates, making these unavailable to download. We then began working on a plan to re-release the affected updates."

The doggy patch was MS14-045, which covers kernel vulnerabilities in 47 of Microsoft's systems. The problems the patch was designed to fix could lead to key information becoming visible to an attacker or allowing the escalation of privileges within a network.

The newly released patch is being pushed out using Windows Update. People without automatic updates enabled are advised to visit the Microsoft site and download the patch manually.