im getting the following error when trying to install umbraco 7 with the SQLCE 4 database...

The database configuration failed with the following message: Keyword not supported: 'file access retry timeout'. Please check log file for additional information (can be found in '/App_Data/Logs/UmbracoTraceLog.txt')

Tracelog says:

2013-09-30 15:13:00,738 [49] INFO  Umbraco.Core.DatabaseContext - [Thread 68] Database configuration status: Started
2013-09-30 15:13:00,801 [49] INFO  Umbraco.Core.DatabaseContext - [Thread 68] Database configuration failed with the following error and stack trace: Keyword not supported: 'file access retry timeout'.
   at System.Data.SqlServerCe.SqlCeConnectionStringBuilder.GetIndex(String keyword)
   at System.Data.SqlServerCe.SqlCeConnectionStringBuilder.set_Item(String keyword, Object value)
   at System.Data.Common.DbConnectionStringBuilder.set_ConnectionString(String value)
   at System.Data.SqlServerCe.SqlCeConnectionStringBuilder..ctor(String connectionString)
   at System.Data.SqlServerCe.SqlCeConnection.set_ConnectionString(String value)
   at Umbraco.Core.Persistence.Database.OpenSharedConnection()
   at Umbraco.Core.Persistence.Database.<Query>d__7`1.MoveNext()
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Umbraco.Core.Persistence.SqlSyntax.SqlCeSyntaxProvider.GetTablesInSchema(Database db)
   at Umbraco.Core.Persistence.Migrations.Initial.DatabaseSchemaCreation.ValidateSchema()
   at Umbraco.Core.DatabaseContext.ValidateDatabaseSchema()
   at Umbraco.Core.DatabaseContext.CreateDatabaseSchemaAndDataOrUpgrade()

Any ideas?