Windows Error 320 mostly appears when we try to run Microsoft Office programs. Error appears in this format:
Run-time error '320': ActiveX component can't create object.
To effectively fix error 320 in Windows 7, Vista and XP you have to apply the fixes stated below:

Clean Temp Folder
Error 320 may appear when some junk files in the temp folder prevent you from running the program. Cleaning the folder may resolve the problem. To do so follow the steps given below:
Corrupt Installation Files
Another reason of Windows error 320 is the corrupt installation files. If the installation file is corrupt you won’t be able to run the program. In this case you have to repair the installation files by installing a reliable fixing tool.
Security Issues
Some security restrictions may also prevent you from running the program as a result of which error 320 may occur in Windows 7, Vista and XP. So its better to disable your Antivirus and Firewall or add MS Office program in the trusted list of both the programs to avoid such kind of problems.
Repair Windows Registry
Simplest solution of fixing the error 320 is to register all the registry entries of the MS Office program again. It can be done manually, but doing it manually is a bit risky as any wrong step may result in data loss. Installing a Registry Cleaner program is a better option than fixing it manually. It automatically locates the broken entries and repairs them.