here this will probably help...it does me good every time
1- Unregister DAO by typing or cut and pasting the following in the Start, Run box:
regsvr32 /u "c:\program files\common files\microsoft shared\dao\dao360.dll"
Click OK.
2- Then similarily re-register DAO by pasting in the following line:
regsvr32 "c:\program files\common files\microsoft shared\dao\dao360.dll"
Click OK.