My only advice would be to try other drivers, either newer, older, or by another source (generic Realtek ones?) I'm not surprised you're not find problems with those scans as I doubt it is related to viruses or spyware. Probably just some little bug somewhere that needs to be ironed out. Worst case, if you just built (and apparently loaded) the machine, reloading it should fix it.
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Urban De-Development
* Athlon X2 4200 | 2048M RAM | 160G HD | 7600GT
* C2D T5250 | 2048M RAM | 160G HD | Intel x3100
* G4 1.33GHz | 512M RAM | 40G HD | Radeon 9200
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