Error 1303 is both installation and program runtime error. Some users got this error while installing Sony Vegas and Adobe products; whereas others were getting it while opening a PDF file with Adobe Reader.
A number of users asked a similar question, “How do I fix error 1303 Windows 7?” This article contains guidelines and step by step instructions to fix error 1303 to troubleshoot your computer:

There is a folder called Program Data stored at the root of the Windows installation disk drive. It contains the information stored by various installed programs regarding application and user settings, customized user preferences, and so on. Error 1303 occurs when the Program Data folder is not having security permissions; thereby programs cannot create new files in it, nor modify the existing ones. To fix error- 1303, allow full access to the folder as guided below:
Windows Registry is a central database containing the operating system and application data for the smooth working of your computer. Many (freeware) programs, computer viruses and accidental users actions make junk and obsolete registry references, causing error 1303. A Registry Cleaner is a utility software designed to scan the registry for incorrect and junk registry references, and delete them in order to fix error 1303 Win 7. Download a reliable Registry Cleaner and perform the registry clean-up procedure.
You may be logged-on from a standard user account and trying to do a task which requires administrative permissions which you do not have. The solution to fix Windows 7 error 1303 is switching the users and log-in from the administrator user account. Please note that you may be required to provide the valid password, if any, in order to log-in from the administrator user account.
The antivirus and firewall protections of your computer may be preventing the concerning program from doing a specific task. This brings error 1303. Disable your antivirus software, and Windows Firewall/ any other third party firewall you are using to fix error 1303.
