memailfilter_usr.exe error

[Layeeq UrK]

Hello,

I need to reboot my server every 2 days because my mail starts backing up in the users mailboxes but Mailenable does not deliver the mail to the client until i reboot the server.
This is the Event Viewer error i get:
The system cannot find the file specified. (Error code 2) at Unable to connect to pipe \\.\pipe\psamailfilterpipe
at (Con::ClientOverlappedPipe::create line 502)
at Mail filter main(wmain line 20)
Execute file name: C:\Program Files\Parallels\Plesk\admin\bin\memailfilter_usr.exe

and

The system cannot find the file specified. (Error code 2) at Unable to connect to pipe \\.\pipe\psamailfilterpipe
at (Con::ClientOverlappedPipe::create line 502)
at Mail Enable mail global filter(CPleskMEMTA::Execute line 141)
Execute file name: C:\PROGRA~1\PARALL~1\Plesk\MAILSE~1\MAILEN~1\BIN\MEMTA.EXE

Please look in to this issue,