I just finished a major crash of a windows 2008 Server that we use for hosting several applications, upon reboot none of the .net websites worked with a Major error pin pointing to a dll of some sort. 

After Further investigation it has to do with some temp files for the actual iis .net 

Error was something like

The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))

Resolution on websites was cleaning the files from the "Temporary ASP.NET Files" Folders, IIS and the App Pool must be stopped to prevent file access issues.

Now I still have a issue with PHP sites on the same server I am investigating now

See Link

jtablesession store failed DB function failed with error number 1062