Dear Professional DNN Administrators Please help me to fix this Error that coming all of the time:

   at DotNetNuke.Services.Search.Internals.LuceneControllerImpl.get_Writer()
   at DotNetNuke.Services.Search.Internals.LuceneControllerImpl.Delete(Query query)
   at DotNetNuke.Services.Search.Internals.InternalSearchControllerImpl.DeleteSearchDocumentInternal(SearchDocument searchDocument, Boolean autoCommit)
   at DotNetNuke.Services.Search.Internals.InternalSearchControllerImpl.DeleteSearchDocumentsByModule(Int32 portalId, Int32 moduleId, Int32 moduleDefId)
   at DotNetNuke.Services.Search.SearchDataStore.StoreSearchItems(SearchItemInfoCollection searchItems)
   at DotNetNuke.Services.Search.SearchEngine.IndexContent(DateTime startDate)
   at DotNetNuke.Services.Search.SearchEngineScheduler.DoWork()

   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)
   at System.IO.File.InternalDelete(String path, Boolean checkHost)
   at System.IO.File.Delete(String path)
   at DotNetNuke.Services.Search.Internals.LuceneControllerImpl.get_Writer()

I don't know!

Maybe sebastian, But I use Dedicated Server with  Windows 2012 and use windows Essential Internet Security for protecting my Server. Is it Enough or Need to install other Anti-virus like Kaspersky or...... ? How can I Find problem and fix it?

I remember when I download Persian Version of DNN 7.4.1 from following Link, The Google Chrome alert me this ZIP file is harmful but I could not find any virus inside. 

http://www.dnnsoftware.ir/Portals/0/download/DNN/DNN_Platform_07.04.01_Install.zip

Would you please check it? or some other things that can help me...

Thank you dear sebastian

Regarding Virus Detection on 3th party, I download your package from codeplex also, I scan it by Virustotal.com and It find again on your package as following Image:

I scan bin folder of your DNN 7.4.2 Release.

And When You using this, you will see several error on your log file because this file is lock:

 AbsoluteURL:
DefaultDataProvider:DotNetNuke.Data.SqlDataProvider, DotNetNuke
ExceptionGUID:540cea8c-4857-4251-8d83-694f3ee64578
AssemblyVersion:
PortalId:-1
UserId:-1
TabId:-1
RawUrl:
Referrer:
UserAgent:
ExceptionHash:x4llVsSI2hsWimOp2U3DAg==
Message:Lock obtain timed out: NativeFSLock@C:\Inetpub\vhosts\cms-iran.com\httpdocs\App_Data\Search\write.lock
StackTrace:
 at Lucene.Net.Store.Lock.Obtain(Int64 lockWaitTimeout)
 at Lucene.Net.Index.IndexWriter.Init(Directory d, Analyzer a, Boolean create, IndexDeletionPolicy deletionPolicy, Int32 maxFieldLength, IndexingChain indexingChain, IndexCommit commit)
 at Lucene.Net.Index.IndexWriter..ctor(Directory d, Analyzer a, MaxFieldLength mfl)
 at DotNetNuke.Services.Search.Internals.LuceneControllerImpl.get_Writer()
 at DotNetNuke.Services.Search.Internals.LuceneControllerImpl.Delete(Query query)
 at DotNetNuke.Services.Search.Internals.InternalSearchControllerImpl.DeleteSearchDocumentInternal(SearchDocument searchDocument, Boolean autoCommit)
 at DotNetNuke.Services.Search.Internals.InternalSearchControllerImpl.DeleteSearchDocumentsByModule(Int32 portalId, Int32 moduleId, Int32 moduleDefId)
 at DotNetNuke.Services.Search.SearchDataStore.StoreSearchItems(SearchItemInfoCollection searchItems)
 at DotNetNuke.Services.Search.SearchEngine.IndexContent()
 at DotNetNuke.Services.Search.SearchEngineScheduler.DoWork()

Is there any Suggestion or help about this mistake?

Thanks