Follow these steps: 1) Stop Windows Installer the service. Hdclone Enterprise Edition 16x Serial on this page.
You can apply this tactic to several other non-essential system maps, thus recovering lots of free space on your drive! You can delete the folder content. And system speed and response wont be affected much since system rarely accesses this map. This way you can gain up to 30% of free space (or in your case, nearly 300MB), and you keep everything in case you'll need this stuff later on.
If asked, choose an option to compress all subfolders and files. Finally, check Compress folders to save disk space. Right click on the Installer map (or just $PatchCache$ map) and choose Properties. If in doubt, you can always go safer way: simply compress entire Installer map! CYBER Blue there. If you have the drive space it is recommended that you keep the baseline caches available. by removing the baseline cache for a product, future repair, patch install, and patch uninstall scenarios may require your original installation media. It is this baseline cache that consumes a lot of drive space on the system drive after installing The baseline cache facilitates patch uninstall by storing the original files so that they can be copied back to the target locations. An excerpt: cause the Windows Installer service to cache any of the original files being replaced into the baseline cache. Heath Stewart's on MSDN blogs explains in detail.
