People who upgraded to the latest version of Windows 8.1 as a part of Microsoft’s Patch Tuesday release last week have been told to uninstall the update while the company looks for a fix to bugs reported by users. In a bulletin, the company said that it has removed the download links to the offending updates until a fix can be applied.

Microsoft said it was investigating reports that users are experiencing a crash alongside “0x50 Stop error message” after upgrading to the update released last week, alongside a pair of bugs that affect font rendering and font selection.

Users who have already installed the update can uninstall it by following the steps laid out in the bulletin. People who aren’t experiencing any bugs don’t have to uninstall the updates, and people who are only experiencing problems rendering fonts can uninstall the updates through Control Panel.

Those people who are having problems with their system crashing need to go through a process that involves registry changes and the deletion of their computer’s font cache. (If that’s you, follow the instructions in the bulletin to the letter.)

These bugs are a rough development for Microsoft, considering this is the first month that the company has used Patch Tuesday to roll out software updates for Windows 8.1 in addition to the usual complement of security patches. The company has said that it will continue to update its operating system on a regular basis going forward, rather than waiting to build up a bunch of new features and releasing them in one big bundle.

It’s not yet clear what’s causing the problems – a spokesperson for Microsoft did not immediately respond to a request for comment – but we’ll update this post as more information becomes apparent.