Some users had difficulty installing the critical Microsoft security update for Adobe’s Flash player, which was issued last week as part of the software company’s monthly patch regime.
Microsoft said it was aware of the problem, describing it as a “known issue”. The company has issued a support document offering a workaround for the problem.
Users are required to delete a pair of Flash-related files, then manually download and install the Player update to get around the issue.
The problem relates to an individual PC’s specific history with Flash and what versions have been installed and uninstalled by the user before trying to install the security update.
The Flash update is necessary as a vulnerability in Windows could let remote attackers run arbitrary code on unprotected machines.
Microsoft also released a critical security patch for its Exchange e-mail server system. There have been no problems reported with this patch.