I had this the other day after my trail version ran out
I got round it by locating the sub key in registry Hkeylocalmachine/software/alcoholsoft and deleting the folder.
You need to r/click on permissions and check 'full control' to delete the key.
Once this is done you can load it up again.
Don't know if i'm allowed but here's a link to the 120% forum with a topic discussing your problem http://forum.alcohol-soft.com/index.php?showtopic=22020
I got round it by locating the sub key in registry Hkeylocalmachine/software/alcoholsoft and deleting the folder.
You need to r/click on permissions and check 'full control' to delete the key.
Once this is done you can load it up again.
Don't know if i'm allowed but here's a link to the 120% forum with a topic discussing your problem http://forum.alcohol-soft.com/index.php?showtopic=22020