Check your HOSTS file too. usually located in C:\Windows\Sytem32\drivers\etc.
Didn't see any websites, but the two most recent "additions" were from 1/26/11 and are called "dxgkrnl.sys" and "dxgmms1.sys." Also, besides all the .sys files there were two .dll files. Not sure what they are.
Nothing against snevey, but I think his scenario is *highly* unlikely.
The files you mentioned are just DirectX related.
I postulate that the AHS website had (and probably still has) a zero-day exploit - hackers were able to identify this, customer info (including CC #s) was collected over a period of time - after said period of time, the "hackers" removed all traces of their intrusion.
This happens all the time. If you spend 30 minutes on Google, and are familiar with IRC, you could go purchase as many credit card #s as your heart desired this very evening.
With that said, I hold no grudge against AHS, and will purchase from them again - I just hope they can identify the root cause.