Hi,
I got the same issue, as you remove targets in the Package Manager of the Qt SDK that contain a qmake.exe (like Simulator Qt 4.7.4 - MSVC 2005), they stay in the "Auto-detected" section.
Apparently this information is maintained in a xml file at: C:\Users\<current-user>\AppData\Roaming\Nokia\qtversion.xml
A work around to get these useless entries out of the the "Auto-detected" list is as follows:
1. Make sure Qt creator is not running.
2. Make a backup of the file C:\Users\<current-user>\AppData\Roaming\Nokia\qtversion.xml
3. Edit the qtversion.xml and locate the section which has the invalid entry.
3. Modify (for that section) the key="isAutodetected">true</value> into key="isAutodetected">false</value>
4. Save the xml file.
5. Start Qt creator. Now when you check the Qt versions, it will be listed as a manual entry, and you can remove it (delete) if you like.
Succes
PvO
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