I've been trying to solve this for a little while by reading posts in this forum and learn quite a lot on setting up the home network. Unfortunately, the problem still there and appreciate any help I can get to solve it. Thanks in advance. Here's the details of my issue: I am using a broadband modem router to connect my three PCs (all running XP Pro) and internet. I can: access the internet on the three PCs (namely PC_A, PC_B & PC_C); see all three computers in the same Workgroup; access the printers on PC_A from PC_B & PC_C But I can't access the PC_A's shared folder from PC_B & PC_C, keep having an error message about not having permission to access the folder, to complicate the matter, I can access the PC_B's shared folder from PC_A. I've checked: Computer name of each PC is ok; Workgroup of each PC is ok; IP addresses of each PC is ok; Network communication is ok, I can ping each PC by its IP address; Printer & File Sharing service is running on each PC; All PCs are using XP Simple File Sharing; Guest account on each PC is active, checked by "net user guest" & I have turned off the Zonealarm on each PC. Any help is appreciated.