Solve : Very strange problem about homegroup?

1.	Solve : Very strange problem about homegroup?
Answer» So, I have rather STRANGE problem at my office and honestly I don't KNOW what to do anymore. We have 5 pc's in my office, 3 of them use windows XP and they are connected to the router by ETHERNET cable. The remaining 2 pc's use windows 7 OS and are connected by wi-fi. We have ENABLED file sharing on all pc's, printer sharing, turned off windows firewall for private network and are connected in a homegroup named OFFICE. Internet is working fine for all pc's, but listen to this, sometimes we can get in each other's folders, sometimes we can't. The problem is with the 2 pc's that are USING windows 7 and are connected over wi-fi, we can't see them or see others on them. I read a lot and tried a lot, but nothing helps, when it doesn't work, we reset the connection 1 or 2 times and we see each other again. Anyone have any clue? Thank you very much if you at least try to help me.

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