Networking Problems

Help, on the mac, when I would click network, I would have to wait about 10 seconds then the windows network would show up. Now, i wait and wait and nothing shows up. I know everything is set correctly cause no settings were changed and other PC's are able to see whats on my windows share folders. Why did it all of a sudden stop? Whats a way to do a hard connect to this other pc to see folders cause its being very sloppy and not working. I need this, its very important!!!!!!!!!!!! Please respond