You have to install a digital signature from the office disk (features/office tools/digital signture for vba, click arrow/run my comp)
Then find the file c:/program files/microsoft office/office and click on self cert.exe and list your name
Then go to v.b. and click on the workbook your using and choose tools/digital signatures/choose/ok/ok.
Last close program (save it), reopen it and it will promp you one last time, check off the checkbox and your all set!!!