>Good day,
>
>I need help in understanding the probable causes of the
>following errors:
>
>1. The driver detected a controller error on \device\harddisk0\partition2.
>

Probably a hard error (bad sector) on the second partition (probably your Extended drive partition) or an error in the partition table itself. I'd run CHKDSK with the /R cmmand line option against each of your logical drives on the first physical hard drive.

>2. RDR - an unexpected network error has occured on the
>virtual circuit to office sales.
>

Something dropped transport for a VPN (a private networking arrangement, frequently used to establish a secured WAN using PPTP). Problem could be in any of a number of places. Reestablish the network connection.