Can an infected XP system infect a Win7 computer on the same router.

Hi there....
I was just wondering if an XP system, once infected, can infect a Win7 on the same router. I know support for XP is dead, but I can't afford to upgrade the OS on the old XP system at this time. I have all available XP updates and Win7 (just did a full format,
and reinstall of XP).
I have no network set up, they are just on the same router, both on a cable, not Wi-Fi.
EDIT: Sorry for posting in the wrong forum....Please move, need be.

I am currently using AVG anti-virus on both machines. 
Would that replace it? Or should I use both on my Win7 system?
I am a gamer, how does it affect gaming? If, at all. AVG has a gaming mode that limits its interference with games.
Thanks for your help!

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