Suddenly, Home Network PC requesting password

Archived from groups: microsoft.public.windowsxp.help_and_support (More info?)

I downloaded the most current updates for SP2 and I also recently
installed some Mobile Phone (Bluetooth) Tools. Also, I have Mobile Phone
Tools installed on my desktop. Now, if I wish to connect to the laptop I
get a MSN type pop-up box saying "Connecting to NAME\Guest" and then
requesting a password. I have entered every conceivable password that I
have used in lower and uppercase but I don't know the password and thus I
cannot communicate with my laptop. My laptop has no problem
communicating or transferring files to the PC. I didn't have this issue
before.

Any advice?

Thanks