Scan does not complete

Scan does not complete

I downloaded the free trial from the site and installed the agent in a few computers (WinXP, Win Server 2003 and Win 7).
The server detected a few agents, but is not detecting all of them. 
Also, for Win 7X64 bit, the scanning does not get completed. If I try to install the patches through it, the patches are never deployed and there is always an error shown.

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