problem with iTunes + internet

I did a system restore on an HP Pavilion dv2000 which had a nasty virus on it, and ever since that was done, whenever iTunes is played, about 30+ mins into playing, the internet starts to not work, and cuts out completely. The only thing that fixes it is a restart. I have tried using Safari, IE, and Firefox, all with the same result, as well as with wired/wireless. The Vista version is SP2. I have had similar problems with my older Dell running XP, where a restart fixed it, and it turned out to be a motherboard problem. What does it look like to you guys?

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