Delete Previous Windows Installation(s)

I have eliminate the Previous Windows Installation(s) for have more space on me SSD,but the problem is was show me 30GB will be free,but after the action end and finish to clean the C was only whit 10GB more....Any 1 can tell me why have give me only 10 and not 30GB ?
Sorry for me English.

CountMike said:

Did you do it from Disk cleanup ? I had to do it twice before it actually cleaned it out. It's at second page of Disk Cleanup under "Clean up system files".

yes i done it like you say it.I have try to do it for 2 times but ,inthe 2 time dont show any more the Previous Windows Installation(s)

CountMike said:

Check your C: disk, there should not be Windows.old folder any more.

the question was why i dont have the free space what it show me there.And from what i know Windows.old is eliminate when you delete temporally install update(and this i have delete it after i done whit the Previous Windows Installations.)

CountMike said:

Try something like this to see where largest folders/files are:
Download Disk Savvy - MajorGeeks
or
Download Folder Size - MajorGeeks

What i most do after?

Try WinDirStat