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We live in one of those areas, no cable service (tv or internet), no dsl, only dial up(yes they still exist), satellite or 4G wireless. We have had both satellite and 4G, both are very expensive for the bandwidth you get and both have small limits or expensive overages. Satellite worse point is the lag, no vonage or skyping (its gets very confusing with a 2 second delay) and its its raining somewhat hard you loose service until it clears up. Also peak time slowdowns were horrible, in early evenings speed would droop down to 10-20k per second, hardly better than dial-up. 4G wireless is fast enough but you can burn though your monthly limit in just days, forcing you to keep raising your plan each week to avoid overages.
First, was she using IE ? That probably accounts for a 75% chance of how her machine got infected in the first place. Just running firefox or chrome with an ad blocker plugin will filter out a majority of the malware scripts and sites. Then since its not tied into the OS there is less chance of anything being able to get in to cuase damage. Then keep flash and java updated, if its installed.