Service pack on network license autocad

[Spakainas]

Hello. I have Autodesk autocad architecture 2009 on my workstation. Problem with slow file loading (max cpu load), because (i think): "The modeless layer manager is a problem with 09. Supposedly they fixed it in 2009 SP3". So, i want to try install service pack, but: my autocad installed from network server (i copied prepaired installation from it and installed). I cant install any service pack (1,2 or 3), because that network license. Error window text: "The service pack could not be installed because the expected Autodesk product could not be located on your computer. Make sure that you are using the correct service pack for the product".
Whether there is a networked version of Service Pack? Any ideas wellcome.
Thnx a lot and sorry for my english.

[ReMark]

Service Pack 3:

http://usa.autodesk.com/adsk/servlet/ps/dl/item?siteID=123112&id=13343557&linkID=9240658

Before downloading view the appropriate Readme file. This tells you what steps to follow for a network deployment.