Could not explain my problem in short terms so will have a go here.
Operating XP on two laptops and one desktop, and an Apple Macbook Pro with Yosemite. The desktop is connected to a Comcast router/modem combo unit, and this router is connected to a 6tb hard drive. I can wirelessly access the 6tb via the router with one XP laptop and the Apple, but not with the second XP laptop nor the desktop which is connected to the router with an ethernet cable. I can access the internet via the router with any of the computers.
I cannot figure out what I need to do to connect to the home wireless network [the wireless router] although I can connect to the internet. I am concerned about changing any setting on the XP laptop that does connect for fear of changing something that I cannot undo. I expect though that the change to the other XP laptop and the desktop to allow them to connect to the home network is simple....but I do not know how.
Any ideas what to do?