Windows Vista SP1 is a set of updates and fixes for Windows Vista that addresses feedback from our customers (in addition to the improvements that are delivered to users through Microsoft Update). In addition to previously released updates, SP1 focuses on specific reliability and performance issues, support for new types of hardware, and support for a few emerging technology standards. SP1 also improves the IT administration experience. Although SP1 is not intended to be a vehicle for releasing new features—however, some existing components do gain enhanced functionality through SP1.
The updates in Windows Vista SP1 fall into three categories, which the following sections describe in detail:
• Quality improvements, including all previously released updates, which address reliability, security, and performance.
• Improvements to the administration experience, including BitLocker™ Drive Encryption (BDE).
• Support for emerging hardware and standards, such as an Extensible Firmware Interface (EFI) and an Extended File Allocation Table (exFAT).
Vsp1cln.exe is an optional tool that you can run after you install SP1. This tool removes older versions of components that have been updated in SP1, which are stored during the installation in case you need to uninstall SP1 later. Saving these older components increases the amount of disk space used.. Typically, you should run Vsp1cln.exe if you want to reclaim this disk space after applying SP1 and if you will not need to uninstall SP1. You can use this tool both online and offline, but you must have SP1 installed. You cannot uninstall SP1 after you run this tool on an image.
Installation of Vista SP1 backs up all the files that it replaces. If you choose to uninstall SP1 at any point of time, these backed up files are readily available.
However after a couple of weeks, if you are comfortable with SP1 and if you are sure that you will not need to uninstall SP1, then you may wish to consider removal of several 100 MB of such back up files and reclaim disk space. You will be able to free disk space of 600-800 MB.
Vista SP1 integrates a tool named Vsp1clean.exe situated in the system32 folder.
To run this tool, open a command prompt and enter: Vsp1cln.exe
For advanced users,there are plenty of switches and options available to Vsp1cln.exe:
VSP1CLN.exe [/h] | [/o: offline Windows files folder path] [/quiet]
/? or /h: display Vsp1cln commands list.
/o:[offline windows files folder path]: location of Windows Vista offline image that wants to remove RTM files
/quiet: silent execution, no display.
/verbose: display extra details.