NIS2010 hangs at boot

Hello,

 

I installed NIS2010 yesterday and after that my system hangs at boot (at the black screen with the XP-Logo). I searched the forum and found a similar problem with the solution to rename the symEFA.sys. With the renamed sys my sytem boots up normally but of course Sonar isn't working properly.

 

Any help would be appreciated. I use a german XP Home SP3 with the newest updates.

 

Thanks!