Double clicking on folder or drive opens search !!

This type of problem normally occurs because some virus called ‘PET32.exe’ , or it can also occur due some other virus which disrupt the windows registry.
Fix:
If search opens when you double click on folder in windows explorer, then see the fix below:
We need to repair some registry entry damaged by virus corresponding to windows shell. Follow either of the steps below:
First :
1. Open Start >> Run or press Window Key + r , this will open the run prompt.
2. Type “regedit” ( without quotes ) and press Enter.
3. Navigate to key
HKEY_CLASSES_ROOT\Directory\shell
4. Double the registry key named Default and set the value to none.
This will restore the normal windows explorer behavior of opening a folder when you double click a folder rather than opening windows search.

Second :
1. Open Start >> Run or press Window key + r
2. Type “regsvr32 /i shell32.dll” ( without quotes ) and press Enter
After the command run successfully, you will see a message saying DllRegisterServer and DllInstall in Shell32.dll succeeded.