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Vista issue accessing network resources

There are five identical computers on this network, and they happen to be the only five in the network running Vista.  All are used via remote desktop by users not local to the network.  All use similar, if not identical, software.  All use Trend Micro Worry Free for antivirus.  For the past week, three of the users have experienced random problems accessing network resources.  The cursor will just spin, sometimes if you wait five or ten minutes the resource will finally come up, sometimes everything will lock up (mouse still moves but you can't do anything), and sometimes it'll go to a black screen with an error "Logon Process has failed to create the security options dialog.  Failure:  Security Options."  Two of these computers have had no problems whatsoever.  One had a couple problems at the beginning of last week, but nothing since.  Two have had continuing - but not constant - problems.  I've googled the error and there are many references to problems with antivirus and antispyware programs, but all five of these are running exactly the same version of Trend Micro and nothing else.  I did a system restore on the two computers with the most problems back a week and a half before any problems were occurring and turned off automatic updates, but that didn't help.  The event logs are no help at all.  These machines have been in production for over a year with no issues.  I am just at a loss as to why only a couple of these machines are having problems, or what's causing them.  I should also say that the same issues can occur when the remote desktop is from within the same local network.  I have not had the chance to work locally on any of the machines -- with no remote desktop at all - long enough to see if the problem exists, but I believe it would.  There doesn't seem to be anything about this issue that points to remote desktop as the issue.  Any help would be very much appreciated!
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landiiiks2
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landiiiks2
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1 Solution
 
radnbneCommented:
I would be inclined to disable the av first and test the performance.
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TimAllanCommented:
Sounds like Vista could be trying to discover a disconnected network resource like a mapped drive that's no longer available.  Can you see any under My Computer?  If so, just remove the offending drive.
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landiiiks2Author Commented:
I did check both of those things...  There are only a couple mapped drives on each and they work fine.  And as of last night and this morning, one of the other computers that so far had been working fine is now having problems, the two that I rolled back are both having problems, but the third one that originally had a problem is working fine today.  Haven't heard about the fifth one yet.  I looked at the one that just started having problems - nothing in the event log, no updates installed over the weekend.  I'm really at a loss here.
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TimAllanCommented:
Just an extra thing to try, go into Device Manager and delete the network card, reboot, redetect the network card driver rejoin it to the network.
Another thing to try is to uninstall TrendMicro for a short time to determine whether or not the antivirus software has downloaded a corrupted definition.  
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landiiiks2Author Commented:
I'll try the network card idea after hours.  One of the people had to be rebooted about four times before she could get anything to open, and even then it took 5 minutes for things to finish opening.  It almost sounds like a DNS issue but I checked and they all have the correct DNS setting.
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AlexTechCommented:
hi,

are the vista PCs uptodate with Microsoft updates ?

post back results
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radnbneCommented:
Also check the times and time zones on the computers.  Make sure they are the same and match the network resources they are trying to connect to.
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landiiiks2Author Commented:
I was under some time pressure to get this resolved so after a lot of googling I applied all the solutions I could find at once.  I prefer to do things like that one at a time, so I know what worked, but I just didn't have the luxury this time.  And I never will understand why the problem cropped up as it did on several (but not all) of the identical computers after a year or so in operation.  But the problem is fixed, so the solution lies within the following steps that I took:  1) Disabled autotuning, 2) Disabled IPv6, 3) Disabled Offline Files, 4) Disabled Remote Differential Compression, and 5) Added Local Service to the Admin group.
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ee_autoCommented:
Question PAQ'd, 500 points refunded, and stored in the solution database.
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