XP SP2 Firewall blocking File Transfers

The firewall built into XP is blocking the file transfer feature. Each time we initiate a transfer it picks a new port so I Can’'t tell it to accept traffic on this one port. Additionally there appears to be a file that when I try to send to another person it knocks them offline. It always happens with the same file and so far no others, they just cant receive them. It says that the transfer was refused or canceled. Any ideas on what I can do to make this work? Spark is looking more and more like the client of choice for us.

I found the same problem, I disabled the firewall on both computers and the same thing happens. The computer sending the file has a message that File transfer was refused. I also added the spark.exe program into the firewall setting with no success

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SilverDrac