Can't choose to install LL besides the existing OSs

[gold_finger]

Ok, so I made everything new as far as I know and Win7 is also already on.
But there's still no option to install it besides the existing OS.
It sais remarkably, that it there isn't any existig OS yet, and that's why it only shows to wipe the disk before installing (and the "something else" option of course).

When I go to "something else", it shows the partition structure. But there is /dev/sda (no space), then "Free space" (it says the amount of the whole hard disk although Win7 is already on it), and /dev/sdb (also no shown space)

Going on Win7 Partition tool, there are two partions shown.

Any advice on how to go on?

What you described (the installer not seeing that another OS is already installed) can happen sometimes if the hard disk at some point in time was partitioned using GPT partitions instead of MBR partitions.  Sometimes there is stray GPT data present on the disk after you change to using MBR partitions (which is what you had on there from last screenshot).  That can happen if the drive used to be in a MAC computer, or if the drive had been used in a newer computer with UEFI firmware and Windows was installed to GPT partitions at some point in the past.  Not sure if that's what's going on, but it sounds like it.

Boot the computer with your live Linux Lite DVD/USB.

• Open GParted -- Menu -> System -> Partition Drives
  
• Take screenshot of the hard drive (/dev/sda)
  
• Hit save and rename screenshot to gpartedA
  
• If you have another drive, switch to that in upper right corner of GParted
  
• Repeat screenshot & save procedure for the other drive, rename to gpartedB
  
• Attach the screenshot(s) to your next post using the button "Insert Image" button (1st on left above smiley faces)
  
• If can't attach screenshots, upload them here and post the link to them with your post.
  

.

In addition to screenshots, open a terminal and post back the output from following commands:

Code:

sudo parted /dev/sda print

Code:

sudo fdisk -l

Code:

sudo blkid -c /dev/null