This is detailed here in this Steam forum post and involves using a free Microsoft Sysinternals application called TCPView.The details on how to achieve this are as follows; It could also just be that in the year or so since you've last used Steam on this computer it needs to download a sizeable update, which could take some time.
Steam want to validate the cache of Team fortress 2, everytime I launch it, pretty darn irritating. I can't support an issue specifically with regard to Windows 8 so if that's the issue, the only solution that I can propose is to wait until this software is officially supported on Windows 8. The following is based on my own experience with Steam doing this to me for TF2 and a similar case can be found here When I first installed TF2 some time ago on a Windows Vista install, it exhibited this behaviour for me. By defragmenting my disk and my game, I managed to resolved the issue.GCF is a file format used by various Source games which essentially acts as a virtual hard disk for content; this file can suffer from internal fragmentation as files get changed and deleted, and this is the only kind of fragmentation Steam concerns itself with.The OS only deals with actual HDD fragmentation, which Steam has no knowledge about - for that to play a role, Steam would have to test file access times, which seems highly [email protected] Madsen Just because Steam has no knowledge of a problem does not mean the problem doesn't affect Steam and its decision to validate files.Your statement is very informative, but doesn't necessarily mean that this is not the solution.As stated, that was my experience and that's what happened.