Once upon a time I had two PCs in a wired network using a D-Link router that connected to a Comcast cable modem. A third PC was connected to the network through a "powerline adapter". Life was beautiful and I could see, access and modify anything from anywhere. Then along came a 4th PC, this time with Vista Home Premium installed. Believing in that universal PC in heaven, I modified the Vista-based PC so that it belonged to the old network called "MSHOME". And then ... life was not beautiful anymore. From the Vista-based PC, sometimes I can see the other PCs, sometimes I can't. That wouldn't be too bad if it was me who decided when I could or couldn't but ... On those times I can see the other PCs from the Vista-based PC, I can access files in only one of them, but then I can not copy/move files from it. When using the non-Vista-based PCs, I can see the others but I can't do much else. BTW, when I say I can "see them", I mean their computer names; not their folder structures. Although I later replaced the D-Link router with a wireless-capable Linksys router, the problem persists. BTW, all PCs are able to access the internet, including a Dell Laptop my daughter bought recently.
Sorry for the lengthy story but, don't know what to do. Do I downgrade the Vista-based PC to XP? Can't upgrade the XPs to Vista for compatibility issues. I've tried a lot of guides available on the internet, to no avail. Any guidance is appreciated. Thanks!!!