A) NOTES BEFORE INSTALL VEGAS PRO 11: >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> Instructions by tano1221 >>>>>>>>>>>>>>>>>>>>>>>> 1) Uninstall any previous version of Sony Vegas Pro (even if you have the new version already installed) 2) Once uninstalled, delete the following folders: C: Program Files Sony C: Program Files (x86) Sony C: Program Files Sony Setup 3) Next, open the Registry Editor; click on Start -> Run -> and type: REGEDIT -> then Click in OK. In the Registry Editor, locate and delete the following registry entries: HKEY_CURRENT_USER Software Sony Creative Software HKEY_LOCAL_MACHINE SOFTWARE Sony Creative Software HKEY_CURRENT_USER Software Wow6432Node Sony Creative Software HKEY_CURRENT_USER Software Wow6432Node Sony Media Software HKEY_LOCAL_MACHINE SOFTWARE Wow6432Node Sony Creative Software HKEY_LOCAL_MACHINE SOFTWARE Wow6432Node Sony Media Software 4) Now you can proceed with a clean installation of Sony Vegas Pro 11. Before install, temporarily turn off ALL anti-virus programs, as well as disabling any Registry Blockers, SpyWare, Firewalls, etc.