Win7 system to open Excel Prompt "No additional digital signature trusted certificate" How to deal with

Reason Analysis: the macro security level of the Excel spreadsheet is set to a high degree and there are no trusted certificates attached digitally signed, so these macros are disabled.

Solution:

1, double hit open win7 in the Excel program, click on the above window tools-macros;

2, in the following Settings window, switch to the "Security Level" tab, the level set to low, click OK Save Settings.

The above explanation Win7 system opens Excel to prompt "does not have the digital signature the trusted certificate" the entire content, if the next operation Excel, encounters the same situation, can solve easily.