Xbox360 users! Hear my cry!

ok so for a while now ive been using my box to sync music from my laptop. after i had reinstalled NOD32 Antivirus, it didnt work i guess do to a firewall that came with the NOD download. so i uninstalled it, and i could sync once again. now, suddenly and with no firewall on or antivirus installed, i cannot communicate with the 360. whats odd is that i can load and play my library in WMC with the 360.
i simply dont get what could be blocking communication. anyone else experienced this?
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