I have installed windows 8 in my laptop and tried to open ‘Android SDK Manager’. It was not open. By googling I found the solution as below.

Go to android-sdk folder what you had set path under windows->preference menu for android.
Edit android.bat file.
Find java_exe=
And in front of add Java.exe path like “C:\Program Files (x86)\Java\jdk1.6.0\bin\java.exe”