no green dot. some clients not communicating with manager

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MicrosoftInternetExplorer4

I know this has been touched upon a number of times but nothing I've read during my search has solved my problem.

I've got at least 50 computers, all dell laptops, (latitude d610s, d620s, d630s) on the network that no longer communicate with the server.  The policy numbers incorporate dates from 2008 up through 2009 so I cannot even pinpoint a relative time that communication was lost.  It seems to be random.  There are a couple hundred other computers, same make and models, on the network running endpoint just fine.  None below version 11.0.4202.75

I've dropped and replaced dozens of sylink files manually and with the drop tool and replacer

secars runs fine

i can ping and telnet into the server

there are enough outgoing connections

ran sytoggle

ran SEP support tool

turned on debugging

had symantec tech support analyze these files with no firm resolution

I've tried updating some clients to RU5

The strange thing is that if I were to reimage the laptops and redeploy them, Endpoint would work.  So it seems like some kind of update to the OS may have caused a problem, however I cannot find any consistency there between laptops that work and those that dont.  It's not feasible to try to redeploy new laptops to all these users so I, like many others, am looking for a way to resolve this remotely.

I'm pretty much at my wit's end with this thing and hope somebody can shed some light or point me in the right direction on this.

Thanks