Yes, if you are logging on to a server this can happen. Beats me why exactly, I struggled with it for months once, and then stopped having my users files and settings profile on the server.
Remember that if you download a huge file to your desktop it may have to be copied to the server and then to where you log in next. Some people may have tons of files in their Desktop;My documents;My Pictures;My Music that they change often and add and remove to. Those extensive changes will have to be mirrored on the server if you have your profile set up that way.
My rule: In any circumstance, keep the total size of your personal files under C:\Documents and settings\YourUserName... (and then /Desktop and /My Documents) as SMALL as possible. This can/will save you boot time for sure. Put them somewhere else.
Also non-working soundfiles that are set to play when you log in and out can mess it up. Take both those away.
Also DHCP or DNS problems I considered candidates for this. I eventually had to reinstall the server and network to make it go away. Still it can happen but very seldom.
Another hard to find problem that occurs, not when booting, but while handling your files: Movie files that are very large can have errors in them where frames are corrupt. This makes Windows XP get stuck on that file just because you touched it (not played it). This is because XP tries to do a quick analyze of it to give you info about it. And it gets stuck at using 50% of your CPU until you reboot. There is a registryhack to turn of this analyzing, but better is to fix the file with some of the free tools that are around for it (index in file needs to be rebuilt). Just thought I'd mention this one too.
Good Luck!
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