SQL 2008 R2 SP1 SRSS wont start

Hi Dears,

SQL 2008 R2 SP1 SRSS wont start

when I try to start it from Services it gives:

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Services
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The SQL Server Reporting Services (MSSQLSERVER) service on Local Computer started and then stopped. Some services stop automatically if they are not in use by other services or programs.
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OK  
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in event viewer:

Log Name:      Application
Source:        SQL Server Reporting Services (MSSQLSERVER)
Date:          12/26/2012 3:06:25 PM
Event ID:      0
Task Category: None
Level:         Error
Keywords:      Classic
User:          N/A
Computer:     SQL01.NBS.Local
Description:
Service cannot be started. System.ArgumentOutOfRangeException: Number must be either non-negative and less than or equal to Int32.MaxValue or -1.
Parameter name: millisecondsTimeout
   at System.Threading.Thread.JoinInternal(Int32 millisecondsTimeout)
   at Microsoft.ReportingServices.Library.ServiceAppDomainController.Start()
   at Microsoft.ReportingServices.Library.ReportService.OnStart(String[] args)
   at System.ServiceProcess.ServiceBase.ServiceQueuedMainCallback(Object state)
Event Xml:

How to solve this issue?

Thanks