Microsoft Corp issued software to fix a record 31 security flaws in its programs, and Adobe Systems Inc warned that glitches in its products could let hackers take control of a user’s PC.

Microsoft released patches on Tuesday that repair vulnerabilities in Windows, Office and Internet Explorer, as well as key pieces of software that businesses use in their data centers.

Adobe said in a security bulletin on its website that Reader and Acrobat users should update their software to the newest versions. Additional software is available if those releases are not compatible with a customer’s PC.