If you modded some time ago, you most probably inserted SLIC 2.0. In order to run W7 and activate it without using loaders, you need to mod your bios again - this time using SLIC 2.1. There's no Asus version just yet - so use something else. I have an Asus motherboard and went with the Dell 2.1 SLIC. Works fine.
Thanx guys, now I get it. I've checked with the dump tool. It says I have SLIC 2.0. I'll re-mod to 2.1 Dell for W7 and change the Vi$ta key and cert. I'll give it a go this weekend and then I will let you know how it went. If all is well I'll post the mod here.
Just one more tiny tidbit to help prevent you from having problems. When you use the mod tool, do not attempt to re-mod the already modified bios file. Get the original unmodified bios from your MB manufacturer website, and use the tool to place the 2.1 slic in it. Trying to re-mod a modded bios can cause weird issues and may tempt the BRICK masons to come out of hiding!
I would think that clearing you CMOS would fix it. But if you only got the error one time and bootet up succesfully afterwards and never saw the error again, don't worry about it. It just means that your old bios setting didn't match the newly flashed bios.