1. A method, comprising: receiving, at a network server computer over a network, an encrypted image and user credentials for a user of a computer, the encrypted image including graphics data and application data, and storing the encrypted image and the user credentials in an image repository that is communicatively coupled to the network server computer; receiving a request to initiate a session, the request including the user credentials; upon successful validation of the user credentials, selecting the encrypted image from the image repository; decrypting the encrypted image; activating a session for a virtual computer associated with the computer; synchronizing session details of the session, based on a run mode selected among plurality of different run modes controlled by the network server computer once completed, with the image and storing a synchronized image in the image repository; and dynamically selecting the run modes to control a location among the computer and the virtual computer where the graphics data and the application data are executed, the run modes comprising: a first run mode that runs the virtual computer and a hypervisor on a local image of the system such that graphic rendering, memory caching of files, and application data execution is performed on the local image; a second run mode that performs graphic rendering, memory caching of files and application data execution at the network server remotely located from the local image; and a third run mode that performs graphic rendering and memory caching of files on the local image while the network server executes the application data.