This computer currently has no detected operating

This computer currently has no detected operating system, and I can't install Caelinux2013 alongside Windows 7. Can anyone help with this issue?

I have a 240Gb Revo drive with windows, as a primary hard drive, and a 240Gb secondary SSD on which to install Caelinux2013. During installation, I check other option to see the partitions, in which the Revo drive is divided into 4 partitions with 60Gb each, but in windows it's just one partition, with the boot on a 100Mb partition.

So everything seems just fine, apart from the not detected operating system, hence I can't install Grub with this method, which I prefer...

I found this during a search, since this seems to be a problem not occuring to often, I had some problems finding a solution...

askubuntu.com/questions/288999/ubuntu-13...ows-7-during-install

But I still have problems understanding what actually is going on?!

Dear blckwtr,

If you are installing Linux on a seperate drive. That is what I have done in my computer.

1. I unplug the existing Windows drive (say 1 hard disk)
2. Install Linux on second hard disk.
3. Plug the Windows drive back once Linux installation is finished.
4. Then by entering boot menu at startup by pressing key F12 (boot menu key may be different for different motherboards). I select either Windows or Linux hard disk to boot.
5. I guess, you will not have problems doing this way.

Regards,
Sriny

Is it no other way of doing this, or to install Grub? I tried installing Unetbootin and installing via USB, whereas I end up with filling my primary C-drive with a bunch of GB files I don't want there, so this install ended up in the trash as being an install that "took control" over my computer. Only thing I want, since I switch over from one OS to the other, is to have possibilities to choose which install I would like, either W7 or CAE... If there is no way of fixing the UEFI in Gigabyte, or to detect the OS from installing menu, I am not so sure I would proceed...

Please, anyone?

BTW, it is Gigabyte Z77X-UD5H

Is there a way to disable UEFI safe boot?