Users are having problems installing the critical Microsoft security update for Adobe’s Flash player issued this week.
Microsoft said it was aware of the problem and issued a support document yesterday offering a workaround.
To get round the problem, users have to delete two Flash-related files, then manually download and install the Player update.
The problem relates to the PC’s specific history with Flash, and which versions the user has installed and uninstalled before trying to install the security update.
Installing the Flash update is necessary as a vulnerability in Windows may allow remote attackers to run arbitrary code on unprotected machines.
Microsoft also released a critical security patch for its Exchange e-mail server system. No reports have so far surfaced about problems with this patch.