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Software, including the operating system, will periodically receive automatic updates that will install during a reboot when the computer is connected to the campus network. Ideally, when on campus, you should restart the computer whenever you are going to be away from it for an extended period of time (i.e. when leaving for lunch or a meeting). Not only will this ensure that your computer stays current on updates, but it will avoid any unexpected, intrusive installations.
Long boot-up time off-campus
Occasionally, users experience extremely long boot-up times when using a domain laptop off-campus. This error is caused by the laptop attempting (and continuously failing) to communicate with the campus network. The way around this is to temporarily disable your laptop's wireless network interface during startup (many laptop models have a physical switch that does this, while others have a function key combination).