Summer_breeze

Yes Panda Software also do an online scanner (Active Scan) and I use this as well as Housecall.

I would like to know what Panda called the virus it found, as I am unable to find much about windows24.exe

I am not sure about your question:

Any way to findout which machine in the network is distributing this virus?
As from what I have found it appears to be more adware/spyware related, and probably not a true "virus" You do not say what environment your network is in (business, college etc) so it might be being spread by people filesharing or suchlike.

A severe slowing down of internet connections seem to be one of the symptoms.

You might try AdAware and SpyBot S&D (links are in one of my posts above) as they would probably be more likely to identify it correctly, and we need to know that to determine the method and source/vector of the contamination.

Cheers