If youre still stuck, there are two major Knowledgebase pages on CS5 installation Troubleshooting installation for Adobe Creative Suite 5 products and Troubleshoot install errors using Creative Suite 5 install logs. These can also help provide answers. Lastly, when reinstalling, the Adobe CS5 Cleaner Tool also known as the CS5 Clean Script helps in resolving installation problems for Creative Suite 5 software. The tool can clean up install records for any pre release installations of CS5 products. The CS5 Cleaner Tool is designed to not interfere with existing installations of previous versions of Adobe Creative Suite products. The tool can also be used to resolve installation problems for Adobe CS3 and CS4 applications, and you can specify which at cleanup time. Run it after youve used the operating systems uninstall procedure on all desired software. If you are still unable to successfully install your CS5 application after following the tools instructions, Adobe Technical Support will help you install or troubleshoot an installation issue with a trial version of Adobe products. Additional phone and web support is available only for registered users of purchased software. Note that CS5 free trial downloads are now available in 1. Mac or Windows Czech, Danish, Dutch, English, Finnish, French, German, Italian, Japanese, Korean, Norwegian, Polish, Portuguese, Russian, Spanish, and Swedish And if youd like a free CS5 e. Book to accompany that free trial, you can download it here 1. Or browse the free online documentation and manuals for Creative Suite 5, or get trained with 1. CS5 online video tutorials.