Work sheet

Hi all,my first post,and thanks anyone that can help.
Calculations Button,
On my worksheet,

“Press the blue calculation button at the top”
This will recalculate your figures. .

When I do that here is what happens.
Click the blue calculations button:
Microsoft Visual Basic small window appears with the message.

“The Macros in this project are disabled, please refer to the online help or

documentation of the host application to enable macros.”

I click on help, it opens second small window with the name of

Microsoft Excel,
“This feature is not currently installed, would you like to install it now”
I did not, because I do not know if this will mess up my sheet.
Would any one be able to help?
Thanks in advance.
Yowie

All fixed.
Just changed Security level from high to medium, and it works like a charm.
Thanks anyway.
yowie