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Windows XP/Windows 7 works under a locked down environment in most organisations. The MSI authors generally have to provide permissions to the installation directory, so that the users without admin rights are able to access and write data into the installation directory. When you set permissions, you are specifying what level of access the user has to the folder and its files and what users can do within that folder such as save, delete, or read files. If you would like to know how to set permissions through Powershell Script, then I would recommend you to read my new blog entry here: http://msiworld.blogspot.com/2012/01/my-first-powershell-script.html There are six standard permission types which apply to files and folders in Windows XP/Windows 7: Full Control Modify Read & Execute List Folder Contents Read Write Each level represents a different set of actions users can perform. See the table below for more information. For folders you can also set your own unique permission...

There are five properties which are required by every Microsoft installer to identify itself from other MSI. These properties are required to be present in every MSI. These are the five properties: 1) Product Name: It is the name of the application you mention in your MSI. 2) Product version: This is the version of the product which you give.. like 1.0.0 etc.. 3) Product code: It is the unique GUID for your MSI. 4) Product language: This is the numeric value of product and should be one of those entries mentioned in Template summary property in Summary information stream. 5) Manufacturer: This is the name of the manufacturer of the product. For future upgrades, it is recommended to add Upgrade code property in the package.