Disallowed Program/Driver kicks are caused by some software running in background (antyvir,firewall,deamon tools,steam,ipod, and so on list continues…) or by a virus/trojan/rootkit/whatever…
would suggest:
-scaning pc with combofix
http://www.bleepingcomputer.com/combofix/how-to-use-combofix
-shuting down antyvirs, firewalls and all 3rd party non windows software (saw that error at google so thats probably some software/driver/process running in background)
if nothing helps submit a ticket to eb:
http://www.evenbalance.com/troubleticket/new_ticket.php?game=et
//EDIT:
some files that causes this error:
Specific files
MGSysCtrl.exe
MGKBHook.dll
tlntwucl.dll
mciawmsp.dll
eSDLoader.exe
MSNCHATHOOK.dll
Openwide.exe
Specific programs
Tlen.pl Instant messaging program
OrbitDownloader
System Control Manager
cfishlman.exe (part of CFi ShellToys)
Shedko sShutdown