Leopard Question- Network

Ok gang got my copy in the mail today and got it installed and in finder it showed my 2 windows networked machines but now a few hours later they are gone. Worse yet I cannot browse to them using smb://(address).

I did have sharepoints installed in tiger so i am wondering if that is what screwed it up? Anyone have an idea here?

Otherwise I will have to reinstall this time wiping the drive clean..