set WL_HOME=C:\bea\wlserver_10.3
cd %WL_HOME%\uninstall
uninstall.cmd -mode=silent

C:\BEA\wls1033_win32.exe -mode=silent -silent_xml=C:\BEA\silent.xml
silent.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!-- Silent installer option: -mode=silent -silent_xml=/home/me/silent.xml -->
<bea-installer>
<input-fields>
<data-value name="BEAHOME" value="C:\bea" />
</input-fields>
</bea-installer>
Ref:
Silent Install
http://download.oracle.com/docs/cd/E14571_01/doc.1111/e14142/silent.htm#i1083883
Silent Uninstall
http://download.oracle.com/docs/cd/E14571_01/doc.1111/e14142/uninstal.htm#WLSIG145