Never delete manually on Windows instead use deinstall.batfrom elevated command prompt from root drive C:\%ORACLE_HOME%\deinstall\deinstall.bat (don't initiate deinstall.bat from inside oracle home)
Remove ORACLE_HOME variable from system/user and ORACLE_HOME/bin from path .
If you removed previous installation and trying to install new database not sure why are you starting with DBCA instead of setup.exe.You mentioned you're trying to install PDB implies you already installed CDB i.e ORCLGLOBAL or am I missing something
P.S:-I don't have enough points to comment