I had set up a wireless connection between my two computers which was working perfectly for transferring files from one to the other. My newer computer is an Asus 7c notebook, running Vista Home Premium, and my old computer a Toshiba satellite running XP Home.
Unfortunately, a few days ago , it suddenly didn't work any more. I don't think I had installed any new programs or anything to interfere with it.
After fiddling, I ended up wiping the connection from both computers and trying to set it up again. I have spent 3 days now trying to get this working, unsuccessfully. After I connect them, both computers say the wireless connection is on and both say the signal strength is excellent (XP) or good (Vista). The status windows of both computers show data being sent and received on the wireless network. However, when I click "View computers and Devices" in the Network and Sharing Centre of the Asus, the name of the Toshiba computer does not come up, even after waiting a long time. Sometimes the name of the Asus computer will appear on the Toshiba but when I double -click it it just says I don't have permission to access it. (However, this was always the case, even when the connection was working, and I relied on transferring via the Asus.) I have turned on Sharing on both computers in every way I can, both on individual files and through the public folder. At one point, after reading advice to someone else on a forum, I also tried turning off IPv6. I also tried a netsh command suggested on another forum.
I'm hoping someone can think of something I can try. Please use Plain English and don't assume I know how to do anything technical. It's no use telling me to have the computers ping each other, unless you give me full and exact instructions. I have to admit I am not a thorough geek in the sense that I don't know any of the technical stuff.

Thanks
Anne