Host usability and security via an isolated environment

Architecture that addresses security concerns while still providing transparent user experience with ability to perform tasks. When a user machine is considered incompliant or compromised due to, for example, a suspected infection, the user machine can be blocked from further access to a network or other computing hosts until the incompliance is resolved. A notification is presented that indicates the nature of the problem, and a way to access an automatically configured isolated environment via which to continue working. The user can be automatically routed to use the alternative isolated environment for temporary access to network resources. Once the user finishes activities in the isolated environment, the system hosting the isolated environment is reverted back to a known good state.