Windows unresponsive when logging into console

Could be caused by a mis-configured setting in any one of the applications running, a needed patch or software upgrade, malware, virus, unecessary software etc. In any case it sounds like resources are being consumed to the point it exhausts your system. I would rule out  viruses/malware first, Trend Micro/Kaspersky offer free online scans. After scanning I remove Kaspersky from add/remove software, as it has caused a few server to have delays in desktop response. If possible run virus/malware scans from safe mode with network support.

Start looking for a memory leak due to one of the applications or one one the processes affected by an application. Go to taskmanager, View, Select Columns, make sure you have "memory usage" and "handle count" selected in Select Columns... watch for continuous increases in either memory or handles, concentrate on the memory usage (sort high to low). Your App/process which keeps increasing in resource use is the likely culprit. If a system process is the culprit you need to dig deeper with other tools.

http://technet.microsoft.com/en-us/sysinternals/bb896653.aspx

 http://technet.microsoft.com/en-us/sysinternals/bb896645.aspx

 http://technet.microsoft.com/en-us/sysinternals/bb896655.aspx

http://technet.microsoft.com/en-us/sysinternals/bb896642.aspx

I know it has been awhile, but this has not stopped.  Since then we have setup 2 Gateway servers with the same configuration.  On the software side, they are setup exactly the same (using scripts and checklists) except no Dell software.  Every few weeks, when logging into either the remote or local console the server becomes unresponsive for about 15 - 30 minutes.  These servers host web applications for thousands of clients and we can't allow this to continue.  This is only happening on Dell servers. 

Any ideas???