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Permissions of Temp Folder
Anki uses the system’s temporary folder to store temporary data. If the permissions of this folder have been changed from the default settings by a rogue app or buggy antivirus app, Anki will not function properly.
If you’re on a Windows 7 machine, the general steps to fix the problem are listed below. As this is somewhat complicated, please ask someone knowledgeable about Windows if you are not sure.
Click on the start bar, and type in %temp% (including the percents), then hit enter.
Go up one folder, and locate the temp folder. Right click on it, and choose Properties.
In the security tab, click on Advanced.
Click on the Owner tab. If you’re not listed as the owner, click the button to take ownership.
On the permissions tab, ensure that you have full control. On a default W7 install the control will actually be inherited from c:\users\your-username.