UPDATE 1-Microsoft, Adobe warn of critical security flaws

* Microsoft issues security patches for record 31 flaws

* Affects Microsoft Windows, Office, data center programs

* Adobe warns of security glitch in Reader, Acrobat

* Flaw could let hacker take control of PC (Adds details on vulnerabilities in Adobe software)

By Jim Finkle

BOSTON, June 9 (Reuters) - Microsoft Corp (MSFT.O) issued software to fix a record 31 security flaws in its programs, and Adobe Systems Inc (ADBE.O) 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.

The maker of design and document imaging software said it has yet to find any malicious software that exploits the vulnerabilities. It classified the risk as "critical," the highest level of risk on its scale evaluating the danger of such threats.