check your odbc connection is using tcp-ip and not named pipes.
check to see if your computer is resolving via broadcast or via dns
analyse for spyware as listed above
check for unnecessary communication protocols such as ipx/spx, netbeui, appletalk etc
ensure service pack and dex levels are consistant with the rest of the network clients
upgrade if necessary to 100baseT if you're on 10baseT
slow login is usually due to network communication problems.
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and they wonder why they call it Great Pains!
jaz