Can anyone help? Thanks!

Delete old Port Monitor DLL......SUCCESS.
Copy new pdf reDirect DLL......SUCCESS.
Installing new PDF reDirect Port Monitor......FAILED. (1722)
Error Occured as follows:
 - Error# =  0
 - DLLErr =  1722
***************************
*      ERROR MESSAGE      *
***************************
Sorry. An error occured while Installing new PDF reDirect Port Monitor......FAILED. (1722)
   - Error Number = 0:
   - DLL Error Number = 1722: The RPC server is unavailable.

This error may occur if the Windows Print Spooler is currently "BUSY".

You can try the following:
   1. Reboot your computer and then try installing again, or
   2. Restart the Print Spooler Service and then try installing again.

If the error persists, you may not have permission to install/remove printers. You can:
   1. Contact your computer administrator for help, or
   2. Visit the forum on our web site for help.

Do you want to visit our support forum for help on installation errors?
 
***************************
*       MEMORY DUMP       *
***************************
 
pData() As Byte =
 0 = 0
End pData()
 
MyDriverInfo3 As DRIVER_INFO_3
  .cVersion As Long =  0
  .pConfigFile As String =
  .pDataFile As String =
  .pDefaultDataType As String =
  .pDependentFiles As String =
  .pDriverPath As String =
  .pEnvironment As String =
  .pHelpFile As String =
  .pMonitorName As String =
  .PName As String =
End MyDriverInfo3
 
MyPrinterInfo2() As PRINTER_INFO_2
  Index = 0
    .pPrinterName As String =
    .pDriverName As String =
    .pServerName As String =
    .pShareName As String =
    .pPortName As String =
    .pLocation As String =
    .pComment As String =
  Index = 1
    .pPrinterName As String =
    .pDriverName As String = PDF reDirect Pro
    .pServerName As String =
    .pShareName As String =
    .pPortName As String =
    .pLocation As String =
    .pComment As String =
End MyPrinterInfo2()
 
MyMonitorInfo2 As MONITOR_INFO_2
  .pDLLName = PDFreDirectMonNT.dll
  .pEnvironment =
  .PName = PDF reDirect Monitor
End MyMonitorInfo2
 
MyPrinterDefaults4Delete As PRINTER_DEFAULTS4Delete
  .pDatatype As Long = 0
  .DesiredAccess As Long = 983052
End MyPrinterDefaults
 
OSInfo As OSVERSIONINFO
  .dwBuildNumber As Long = 7600
  .dwMajorVersion As Long = 6
  .dwMinorVersion As Long = 1
  .dwOSVersionInfoSize As Long = 148
  .dwPlatformId As Long = 2
  .szCSDVersion As String * 128 =
End OSInfo
 
64bit CPU = 0
 
hPrinter As Long = 0
MyKey As String =
MyKeyString As String =
MyKeyValue As Long = 0
Result As Long = 0
MyError As String = Sorry. An error occured while Installing new PDF reDirect Port Monitor......FAILED. (1722)
   - Error Number = 0:
   - DLL Error Number = 1722: The RPC server is unavailable.

This error may occur if the Windows Print Spooler is currently "BUSY".

You can try the following:
   1. Reboot your computer and then try installing again, or
   2. Restart the Print Spooler Service and then try installing again.

If the error persists, you may not have permission to install/remove printers. You can:
   1. Contact your computer administrator for help, or
   2. Visit the forum on our web site for help.

Do you want to visit our support forum for help on installation errors?
Level As Long = 0
pNeeded As Long = 0
I As Long = 2
InstallPrinter As Boolean =  True
ShowErrors As Boolean =  True
System_Dir As String = C:\windows\system32\
MyUserAppPath As String = C:\Users\Irene\AppData\Roaming\PDF reDirect\
Monitor_DLL_Name As String = PDFreDirectMonNT.dll
Printer_Driver_Dir As String = C:\Program Files\PDF reDirect\Drivers\Win 2K-XP\
System_Printer_Dir As String =
Generic Error Code as Long =  0
DLL Error Code as Long =  1722

Thank you for ur reply. Can i know how to check if microsoft windows print spooler is turned on??