hello Dan and David, I'm Japanese so sorry my poor English.
I faced this problem, too. and find a solution in msdn.Microsoft.com
You have to cleaning sum Registory Keys
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\VPCAppSv
and remove file
C:\Windows\system32\drivers\VPCAPPSV.SYS
after uninstalling VPC/CE emu in the Add/Remove Programs List.
to get more information visit
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/wceintro5/html/wce50conMacallanReleaseNotes.asp
and see "Cleaning your system after uninstalling Windows CE 5.0"
Anmochi
March 2006