HP G42 with an i5 M430 with 4GB RAM and W7 64bit
I can imagine it didn't came with ATI or nvidia graphics card right? The only thing I would check is intel graphics drivers, see if they are updated, and update skype too. And I would google a bit for possible issues with intel GMA when using skype. Not sure but maybe try another webcam. What about bandwidth? is internet fast enough in cambodia to make these kind of conference calls without glitches whatsoever?
If its an overheating problem, try another energy profile, lets say, low performance (less energy consumption/battery friendly, it will run slower of course)
I picked it out very carefully at the time.
I can assume your girlfriend does work a lot with the laptop, if that is the case, then a core i5 M430 was ok 2 years ago, it was the latest intel processor at the time (that series was released in Q1 2010), and even today is a very respectable processor.
Are you planning a laptop switch? But if you picked the laptop for using with skype, then I would have chosen something way more cheaper with a *minimal* in (serious) graphics power, lets say either an AMD laptop with HD3200/4200 series onboard (while way slower than a core i5, they were way cheaper, and won't overheat when using graphic intensive apps. At least I can say mine works with a broken fan inside, but I'm not in cambodia, although is pretty hot right now.)
Its a pitty zacate was released 1 year ago and not 2 years ago, that would be not just a bang for buck, but never seen such performance and battery friendlyness in a system before, and such tolerance to heat. And I'm talking about 15 inches full keyboard laptops. Zacate is ice cold. Still, its way slower than a core i5. But I wouldn't get any intel computer unless it comes with nvidia or ati card. no matter which model.