Windows 7 Problem to uninstall windows 7 that was install previously on another drive

I just bought a new SSD drive and installed windows 7 on it, i still have the previous windows 7 install on another drive. I tried to format my old HDD drive but it doesnt work, because windows is still install on it !! How do I do to format or uninstall windows ??
 
You could try a linux live CD/DVD/USB Drive, as most linux live images have tools to format drives.
If you have a spare CD/DVD/USB drive I could give you instructions on how to just remove windows from your other drive then just overwrite/throw away your linux image.
 
As I see it, you should have formatted the old Windows you had - once it's there, it's there, and it won't give up - it's actually a good quality, preserving the fundamental.

I think Ralph is on a good trail. Personally, I would use something like http://www.aomeitech.com/aomei-partition-assistant.html or http://gparted.org/download.php to clean it all, everywhere, thus get a truly clean install.

Fixing things may quite often take more time than to start from beginning. Not really sure about it, but I give my standard advice: have System in one place, and have personal files another place / partition. That way, when you need to fix System, you need not to interfere with personal stuff.

Best of all.
 
As I see it, you should have formatted the old Windows you had - once it's there, it's there, and it won't give up - it's actually a good quality, preserving the fundamental.

I think Ralph is on a good trail. Personally, I would use something like http://www.aomeitech.com/aomei-partition-assistant.html or http://gparted.org/download.php to clean it all, everywhere, thus get a truly clean install.

Fixing things may quite often take more time than to start from beginning. Not really sure about it, but I give my standard advice: have System in one place, and have personal files another place / partition. That way, when you need to fix System, you need not to interfere with personal stuff.

Best of all.

Yeah gparted is why I suggested a live image as most come with gparted and gparted is very good at re partitioning drives and I find it better then most commercial solutions
 
It has been a few days, so hopefully you have it worked out. But the reason you may not have been able to erase your old drive was it was still being used as a boot drive. Disk Management will show which partitions are the System (boot) and Boot (OS) partitions. If you don't have it worked out, post a picture of your Disk Management window by attaching here using the more options button.
 
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