Before your computer be discovered by other PCs in the network you need to setup network connection first with few steps.
1) Right click any folder and choose Sharing then click on Network Setup Wizard.
2) When choosing to setup new network enter as name WORK GROUP in Workgroupname.?
3) Wait the progress to start the network sharing to end.?
4) The window to share a folder will change after and you can choose if you want to share it or not.?
5) If the folder is shared a hand will appear mean the folder is being shared in the network.?