Question : HDD disk space disappearing

Active Directory installed on windows server 2003 and excahnge 2000 also installed
Exchange files are on D drive (135GB). Free space on D drive is showing 59GB and sometimes its showing 19GB keeps on coming down suddenly system restarts and it shows 59 or 58 GB agian.
Actual free space should be 95GB as the other is consumed by Exchange.
I have run stinger, symantec mail security 5.0 is running from begining,
This problem from last 2 weeks, Need a solution with out affecting exchange mail box.

Answer : HDD disk space disappearing

Hi,
Installed an additional DC its working fine
--- but iam not able to log on to old Active directory server after ctrl+Alt+Del it just a blank screen. Clients working fine and even email is working fine. What should i do?
--- Can i install symantec Corporate antivirus 10.2 & symantec mail security 5.0 on new DC.
--- How to install exchange on new server and move mail boxes