Cannot open volume for direct access.

When you update your ZoneAlarm software to the latest build as of June 2004,
you may encounter an issue which, in some cases, prevents chkdsk from running,
because it cannot gain direct access to the disk. 
This issue is due to a conflict between the chkdsk
 and ZoneAlarmıs VSDATANT component.
VSDATANT resides on computers running ZoneAlarm as a hidden,
non-PnP (Plug and Play) device.
Temporarily disabling this device allows chkdsk to run properly.

The problem can be solved by temporarily disabling
 the VSDATANT device by following these steps:

1. Configure ZoneAlarm preferences so that ZoneAlarm does not load at system startup. 
This can be done by running the ZoneAlarm Control Center
and clearing the Load at Startup check box. 
This step is optional, but doing this prevents ZoneAlarm
from unnecessarily alerting you to a system change.
(Since you are performing a boot-time operation, 
you already are aware of this system change.) 
Keep in mind this setting will only be temporary.

2. schedule a check disk to be run on next reboot..

3. Start the Computer Management applet by right-clicking My Computer
then selecting Manage.

4. Click Device Manager in the left-hand pane.

5. On the Computer Management menu bar, click View, and ensure that Show
hidden devices is checked.

6. Click the + sign beside the Non-Plug and Play Drivers entry in the
right-hand pane of the Computer Management applet to expand these devices.

7. Scroll down to the entry for VSDATANT, right-click it, and select
Disable.

8. Reboot your computer. chkdsk should run.

9. return to the Computer Management applet and re-enable the VSDATANT device.

10. Return to the ZoneAlarm Control Center, re-enable the Load at Startup
option, and reboot the computer.