Terminal Services running very slow on Server Standard 2008 64bit

I have currently upgraded our servers to 2008.  In doing so I now have a Small Business Server 2008 running as a PDC and Server Standard 2008 64 bit running TS services.

The SS machine which is running as a Terminal Services server.  For some unknown reason all users find using a Terminal session to this server very slow, with a small lag seems to occur when opening windows and typing text.  

The server is an Intel custom of a very high spec, we have run full diagnostics and fully checked the internal RAID (which is running 2 mirrored drives).  There is absolutely no hardware issues at all.  I have also installed a new harddrive, setup the OS again from scratch and re-configured the server, still the same issues occurs.  I then setup one of the old Fujitsu Siemens servers with a new HDD, setup the OS and re-configured the server exactly as the Intel server.  This server runs perfect with no lag at all, which is annoying as it is nowhere near the spec of the intel server.  The only difference between the two servers is that the Fujitsu is running a 32bit version of 2008 and not 64.

The clients have all been updated to the latest version of RDC and are running 32bit versions of XP Pro with a few running Windows 7.  

Please can anyone shed any light of this very frustrating situation.

Regards, Lawrie
Lawrie GormleyAsked:
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Lawrie GormleyConnect With a Mentor Author Commented:
Ok so it seems I was way off the mark and the intel NIC drives were all over the place.  Downloaded the latest NIC drivers, unistalled the NIC and reinstalled.  All is now perfect as far as I can tell.
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shanyuenCommented:
Do you check on perfmon, when user complaining slow.
What happen on the server ?
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Lawrie GormleyAuthor Commented:
I have disabled windows installer in the Group Policy for the group all the terminal users are in.  Things are running a million times quicker.  I will monitor this over the next few days and update.
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solvedataCommented:
Use a monitoring tool to check out whats happening. Most vendors offer free evaluations - just try one of these tools:

http://openview.hp.com/partner/isv/HERMES_prod4.jsp
http://www.eginnovations.com/web/terminalservermonitor.htm
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Lawrie GormleyAuthor Commented:
Seems that everything is still running slow.  I am awaiting on the confirmation from eg innovations regarding the monitoring software.  I'll see what results we get from that.
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Lawrie GormleyAuthor Commented:
I can't seem to get a hold of anyone at eg innovations or I'm still awaiting them contacting me.  Could this be a 64bit issue.  This morning I am going to install the 64bit software on the old Fujitsu server and see whether the slow issues occur of there.
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