i have samsung pc share manager (PCSM) working on windows 7 fine. Feeds to my 630 series tv.
Some things that can mess you up are:
1- make sure that you tell PCSM that its ok to feed to your tv. You do this by going to PCSM and choose SERVER from the menu and then choose the bottom option (i forget what its called) but it lets you allow or deny dlna devices like your tv. by default, everything is denied, so the TV won't see the PCSM server.
2- make sure your firewall software is allowing PCSM communications, this is different on each one, so can't help you here. If you are not certain if your firewall is causing problems, try temporarily disabling it and see if the tv works now.
3- make sure that the tv is on the same subnet as your pcsm server. for most people this won't be a problem as the tv will just automatically get an IP via DHCP from your router. But, for those that it does affect.. =] 192.168.0.x or 10.0.1.x are examples of subnets (i'm dumbing this down a LOT) so if your PCSM machine has an ip of say 192.168.0.100, then your tv needs to have an ip starting with 192.168.0.??? (1-254).
4- if you just installed and shared folders, you HAVE to hit the refresh button in PCSM for it to find the videos, create its little tag file and actually show them on the tv. That threw me the first time.