Online site works perfectly on one computer but not on the other (1 Viewer)

[oshri]

Hi,
I got two computers at home.
I made an online site using the generic site creator and it works perfectly (xp).
However when i tried to run it on my other system (win 7) i can see all the videos and it is buffering.
After the buffering it says that it can not play the video.
here is the relevant part of the log

2010-12-12 09:46:08.290504 [Debug][RTMPProxy(21)]: [OnlineVideos]Property: no-name. STRING: onStatus
2010-12-12 09:46:08.293504 [Debug][RTMPProxy(21)]: [OnlineVideos]Property: no-name. NUMBER: 0
2010-12-12 09:46:08.296505 [Debug][RTMPProxy(21)]: [OnlineVideos]Property: NULL
2010-12-12 09:46:08.300505 [Debug][RTMPProxy(21)]: [OnlineVideos]Property: OBJECT ====>
2010-12-12 09:46:08.303505 [Debug][RTMPProxy(21)]: [OnlineVideos]Property: Name: level, STRING: status
2010-12-12 09:46:08.305505 [Debug][RTMPProxy(21)]: [OnlineVideos]Property: Name: code, STRING: NetStream.Play.Start
2010-12-12 09:46:08.308505 [Debug][RTMPProxy(21)]: [OnlineVideos]Property: Name: description, STRING: Started playing hd/1210/0612101700champs02.
2010-12-12 09:46:08.311505 [Debug][RTMPProxy(21)]: [OnlineVideos]Property: Name: details, STRING: hd/1210/0612101700champs02
2010-12-12 09:46:08.314506 [Debug][RTMPProxy(21)]: [OnlineVideos]Property: Name: clientid, STRING: TtlI0l80
2010-12-12 09:46:08.318506 [Debug][RTMPProxy(21)]: [OnlineVideos]server invoking <onStatus>
2010-12-12 09:46:08.321506 [Debug][RTMPProxy(21)]: [OnlineVideos]onStatus: code :NetStream.Play.Start, level: status
2010-12-12 09:46:08.325506 [Debug][RTMPProxy(21)]: [OnlineVideos]System.Net.Sockets.SocketException: An existing connection was forcibly closed by the remote host
at System.Net.Sockets.Socket.Send(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)
at System.Net.Sockets.Socket.Send(Byte[] buffer, Int32 size, SocketFlags socketFlags)
at HybridDSP.Net.HTTP.HTTPServerSession.Write(Byte[] buffer, Int32 offset, Int32 count)
at HybridDSP.Net.HTTP.HTTPFixedLengthOutputStream.Write(Byte[] buffer, Int32 offset, Int32 count)
at RTMP_LIB.RTMPRequestHandler.HandleRequest(String url, HTTPServerRequest request, HTTPServerResponse response)
2010-12-12 09:46:08.330507 [Debug][RTMPProxy(21)]: [OnlineVideos]Request finished.

What could be the reason for that?

Thanks allot
Oshri