Hi gadgarra,
Sorry for the delay, got busy this week. There are a few things I can think of to try. Make sure your Vista is updated to
SP2 (Service Pack 2) level and
all post-SP2 updates have been installed on C2. There are many networking file updates with both SP1 & SP2 in Vista that allow the Vista to perform proper networking and file/folder sharing. So ensure that C2 is up to date update-wise.
There is a thing called
"persistence" which sometimes keeps
"ghost images" of your old network setup on 1 or more of your computers. This happens when some computers are left on (not power-cycled), as
"ghosts" of old file shares, workgroup names, PC names, domain names, etc. live in the RAM on one or more of the computers not powered off.
These of course re-propagate over your LAN between all your other PCs; in your case, the other 2 Win7 PCs you just re-did the Homegroup networking on. I suggest you actually power-cycle
ALL 3 of your PCs at the same time along with your wireless router. Leave all devices off for at least 5 min. and power on and check your shares and your Homegroup names for each of your 3 PCs. This should clear out the
"ghosties" from your Windows explorer.
If the problem persists after you try this, there may be a problem with the C2 PC windows networking or system files.
What I would do there, is to
FIRST backup all your personal data on C2 to external media and perform a full Windows reinstallation or Windows reset from factory Recovery Disks/USB Stick if you have them. Ensure on the reinstallation or reset that you choose
"CUSTOM" on the reinstall and format entire hard drive, or at the very least the data partition. You should also run a hardware test on the bootdrive on C2 (C: drive) using the free
SEATOOLS utility available from Seagate.com. Run
BOTH the short and long tests, and if
SEATOOLS returns any errors, then that drive has failed and must be replaced!
Most likely a fatal hard sector error on that drive is located in the middle of one or more of the Vista networking files and could be producing your network sharing issue. Replacing the faulty hard drive, with a fresh Vista install and updates, should fix that problem.
Be aware that since C2 is a Vista PC, that windows is now 9 years old, and if that PC came from the factory with Vista installed and you've never replaced the hard drive, chances are very high that it's got a problem by now, so it's best you find out now there's an issue with it, fix it, and that most likely will solve your network sharing problem.
After, that it gets so ugly, I won't post it, as this often causes people a lot of angst and frustration--so I'll just ask you to post back if none of the above works. Probably a 90% chance or better that it will be fixed by here.
Best of luck,
<<<BBJ>>>