Access Windows in a network from Leopard

[Ferreira]

Right after I installed Leopard, whenever I try to connect to my Windows Vista PC over the network I can only get

I had everything configured so it worked with Tiger. Is there anything I have to change to be able to write on an NTFS partition on the network from Leopard?

 

[tersono]

Check permissions of the shared directory on your Vista box, as it's 99% likely that's where the problem lies.

When accessing a drive over the network, the filesystem (NTFS, FAT, Ext2, whatever) doesn't matter - what does matter is that you are authenticated with read-write permission for the share/directory concerned.

 

[Ferreira]

I have checked and I have write permissions for that folder, but Leopard somehow finds that it has read-only permissions.

I think I nedd to set up Leopard to use my Windows username and password, but I can't find out how to do this.