I canot connect to my database I think I may have altered my user

Server Error in '/' Application.
Login failed for user 'hsECUmbraco'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.Data.SqlClient.SqlException: Login failed for user 'hsECUmbraco'.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:

[SqlException (0x80131904): Login failed for user 'hsECUmbraco'.]
   System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +1316
   System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +108
   System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +126
   System.Data.SqlClient.SqlConnection.Open() +125
   Microsoft.ApplicationBlocks.Data.SqlHelper.ExecuteNonQuery(String connectionString, CommandType commandType, String commandText, SqlParameter[] commandParameters) +67
   umbraco.DataLayer.SqlHelpers.SqlServer.SqlServerHelper.ExecuteNonQuery(String commandText, SqlParameter[] parameters) +21
   umbraco.DataLayer.SqlHelper`1.ExecuteNonQuery(String commandText, IParameter[] parameters) +85

[SqlHelperException: Umbraco Exception (DataLayer): SQL helper exception in ExecuteReader]
   umbraco.DataLayer.SqlHelper`1.ExecuteReader(String commandText, IParameter[] parameters) +142
   umbraco.cms.businesslogic.web.Domain.<GetDomains>b__0() +89
   umbraco.cms.businesslogic.cache.Cache.GetCacheItem(String cacheKey, Object syncLock, CacheItemPriority priority, CacheItemRemovedCallback refreshAction, CacheDependency cacheDependency, TimeSpan timeout, GetCacheItemDelegate`1 getCacheItem) +132
   umbraco.cms.businesslogic.web.Domain.GetDomains() +158
   umbraco.cms.businesslogic.web.Domain.GetDomain(String DomainName) +44
   umbraco.requestHandler.CreateXPathQuery(String url, Boolean checkDomain) +232
   umbraco.requestHandler..ctor(XmlDocument umbracoContent, String url) +712
   umbraco.UmbracoDefault.Page_PreInit(Object sender, EventArgs e) +1061
   System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
   System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35
   System.EventHandler.Invoke(Object sender, EventArgs e) +0
   System.Web.UI.Page.OnPreInit(EventArgs e) +9010534
   System.Web.UI.Page.PerformPreInit() +31
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +328