Crystal Reports: Login failed for user sa. The user is not associated with a trusted SQL Server

i nned to create a crystal report with pivot or cross tab

i try to create a new connection in crsytal report i get error

--------------------------- Crystal Reports ActiveX Designer --------------------------- Logon failed. Details: ADO Error Code: 0x Source: Microsoft SQL Server Native Client 10.0 Description: Login failed for user 'sa'. The user is not associated with a trusted SQL Server connection. SQL State: 28000 Native Error: --------------------------- OK   ---------------------------

i even directly tried the cross tab in CR but i get blank