My Network Places shows just my PC

Hello, trouble: on my PC (the same where I write this post) I can’t see any other computer in workgroup (I can find them and open them through search by name or IP address) – but they can each other. All others are cloned from my PC (but no firewall app) and on my I have a well set-up Comodo Firewall. Only other stuff I have are XP-antispy (with speed up network browsing tweak) and Autopatcher – everything related to Security is enabled). Didn’t mess with services.msc for DHCP and DNS related stuff