Windows Vista SP1 (Service Pack 1) is large and huge, and the free hard disk space requirement to install SP1 in Vista system is high. The additional space required not only by updated system files in SP1 package, but also used by the unpacked and expanded installation setup files of Vista SP1. Vista SP1 installer package extracts and uncompress the files used for installation in system drive (normally C:), and the size of these files is large. After successful installation of Service Pack 1, these installation files no longer required and became junk files.
Sometimes, the Vista SP1 setup fails to clean and remove these temporary files used for installation of service pack, leaving the files to occupy and hog hard disk space, causing free space in root system drive to reduce smaller. There is an easy and effective method to recover and reclaim the lost space occupied by unused temporary Vista SP1 files. It