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Perhaps the most widely anticipated—and welcomed—change to Windows 7 concerns User Account Control (UAC). A slider now lets you control the degree of annoyance you’re willing to endure to increase security.
Solution Center incorporates the security monitoring items previously found in Security Center, and adds links to troubleshooting and maintenance tasks.
Reliability Monitor continues to log software installations, crashes, warnings, and other errors tracked over time to generate a 1-to-10 stability score. In Windows 7, Reliability Monitor tracks more types of events, offers new options for viewing and working with the monitored information.