Hi , I would like to know few things about the below. After install sql 2005 we have some registry keywords populated and i would like to know what are all the possible values for reg_word and basically what does it indicate? Can anybody can share any kb article on this? HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1- 5-18\Products\<Product Code>\Patches\<Patch Code> Here the keys am looking for some explaination. MSI3= 1 Patch Type=0 State=1 Uninstallable=0 Would like to know what are all the possible values and what does each of the 4 reg_words mean? except uninstallable i dont understand others. Thanks in advance.