This may seem obvious, but is there disk space on drive c?

>Below is the sequence of events:
>
>1. User takes any PRINTING option on the menu
> (even if it spools report to the file only).
>2. It prints successfully
>3. User takes any menu option.
>4. System crashes: 'Can not write to drive C:'. Fatal exception
> error.
> Blue screen. Reboot.
>
>System works perfectly well for handreds of users. It persistently happens only with some of users.
> If somebody saw anything like that, please help.
>Thank you so much!!!
>Boris Lifschutz