Did this just yesterday: OS Win 7 Pro 64 SP1. Driver AMD 15.200.1062.1004.
No difficulty with the latest 3dm11 and SysInfo 5.26 combination -- benchmark ran and produced submissions.
With 3dMark, specifically FireStrike, latest version and SysInfo 5.26. I get the message "System Info has stopped working" -- reason APPCRASH -- after it scans long enough that it usually finishes. 3dMark hangs waiting for SysInfo. Three SysInfo processes are left open in Task Manager: Helper, Scan and EasySysInfo. Closing 3dMark and trying again gives the same message, hang and 3 more processes open. Unless they are ended in Task Manager, these open processes build up with each retry. Terminating the built-up processes does not change performance.
When I turn off SysInfo, the benchmark runs. When SysInfo is enabled to scan, but NOT monitoring, the benchmark runs. The hang etc, happen when SysInfo is set to Monitor hardware. My guess from this and the timing of the "stopped working" message is that SysInfo has trouble in Win 7 with the transition from scanning to monitoring.