Ok now I managed somehow to screw up my stuff here, too. The problem was solved all the time until yesterday were suddenly everything was messed up again (no AA).
BUT
after a lot of trying I found a way to make it work again with 190.62! I followed this link:
http://forum.nhancer.com/showthread.php?t=1086&page=9 and found following solution:
"Uninstall nHancer v2.5.3 beta 2
Uninstall v190.62WHQL
Reboot
Delete all remaining nvapps.xml and extendedProfiles.xml files (use search on c:\) <-- important!
Reinstall 190.62 WHQL
Go into CP and in 3D options and in "AA mode" for global, set AA mode on "Override all applications parameters"
Reinstall nHancer v2.5.3 beta 2
Set AA in all your games
Go back into CP and restore original settings of 3D options for global"
The order is very important!! So follow it wisely.