alex, thank you for information. Is it OK to use the following code:

DECLARE INTEGER SHDeleteKey IN Shlwapi ;
INTEGER iBaseKey,;
STRING sSubKey

SHDeleteKey(HKEY_LOCAL_MACHINE,"Software\CLASSES\Installer\Products\D4630248E9E66D11E8F400008E6D868E" )

Dos dis disable the stuid Windows Inbstaller prompt if my application
files are deleted ?

>Under Win98/2000 and later (or Win95/NT4 with Internet Explorer 4.0) you can also use API function SHDeleteKey() in Shlwapi.dll. It will remove the key, key's values and all subkeys in one call not depending on Windows version.