RS problems after upgrade from SQLExpress to Standard

Hello

I've uninstalled SQLExpress(with adv. features, RS worked fine) and then installed Standard edition.

After reinstallation and deploying reports I failed in viewing report through web browser.

Here are errors:

- when I try to view report

Reporting Services Error

---

An internal error occurred on the report server. See the error log for more details. (rsInternalError) Get Online Help Error executing child request for /ReportServer/Pages/ReportViewer.aspx. Exception of type 'System.Web.HttpUnhandledException' was thrown. Value does not fall within the expected range.

- when I try to navigate to Get Online Help Error executing child request for /ReportServer/Pages/ReportViewer.aspx. Exception of type 'System.Web.HttpUnhandledException' was thrown. Value does not fall within the expected range.

- when I try to navigate to http://localhost/reports

The website cannot display the page

Thank you for any help!

Here is log:

aspnet_wp!library!1!05/09/2007-17:05:01:: e ERROR: Throwing Microsoft.ReportingServices.Diagnostics.Utilities.InternalCatalogException: An internal error occurred on the report server. See the error log for more details., ;
Info: Microsoft.ReportingServices.Diagnostics.Utilities.InternalCatalogException: An internal error occurred on the report server. See the error log for more details. > System.InvalidOperationException: Computer name could not be obtained.
at System.Environment.get_MachineName()
at Microsoft.ReportingServices.Diagnostics.RunningJobContext..ctor(String jobId, String requestPath, JobActionEnum action, JobType type, RunningJobList parentList, UserContext userContext, HttpContext optionalWebCtx)
at Microsoft.ReportingServices.Diagnostics.CancelablePhaseBase..ctor(String jobId, String requestPath, JobActionEnum action, JobType jobType, UserContext userContext)

.....

aspnet_wp!library!1!05/09/2007-17:05:01:: e ERROR: Error rending control: System.ArgumentException: Value does not fall within the expected range.
at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
at System.Web.Configuration.MachineKeySection.GetHMACSHA1Hash(Byte[] buf, Byte[] modifier, Int32 start, Int32 length)
at System.Web.Configuration.MachineKeySection.HashData(Byte[] buf, Byte[] modifier, Int32 start, Int32 length)
at System.Web.Configuration.MachineKeySection.GetEncodedData(Byte[] buf, Byte[] modifier, Int32 start, Int32& length)
at System.Web.UI.ObjectStateFormatter.Serialize(Object stateGraph)
at System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Serialize(Object state)
at System.Web.UI.Util.SerializeWithAssert(IStateFormatter formatter, Object stateGraph)
at System.Web.UI.HiddenFieldPageStatePersister.Save()
at System.Web.UI.Page.SavePageStateToPersistenceMedium(Object state)
at System.Web.UI.Page.SaveAllState()

.....