Has anyone else noticed the correlation between the common issue with Internet explorer displaying text in italics, regular versions of Arial, Veranda etc going missing on Windows 7 Machines, to only HP Machines?

I regularly get teachers / support staff with missing fonts on newish Win7 builds, where the fonts were there, but then got deleted / corrupted and therefore Win7 reverted to italics, or in some cases, such as SIMS reports / census's crashed completely.

I have noticed it is only HP machines that do this. (or to my knowledge)

Obviously the easy fix is to simply copy across the fonts from another machine, but i was wondering if anyone had any idea why this happens in the first place?

Many thanks!