In order to troubleshoot the problem, kindly refer the following steps:- Please carry out the following steps:- Go to C:\Winnt folder and rename bkupinst.log to bkupinst.old, then please carry out the steps mentioned in the technote link.
Title:- Installation of VERITAS Backup Exec (tm) 9.0 for Windows Servers fails with the following entry in the bkupinst.log: "Setup has detected existing data/log files. Please make sure to delete/move the files before re-running setup."
http://seer.support.veritas.com/docs/258973.htm
We hope this helps.
Incase if the problem persists, please refer the following technote and let us know the outcome of Bkupinst.log file.
Bkupinst.log and MSDE_BKUPEXEC.log file located in Windows folder.
How to locate the logs generated during the installation of VERITAS Backup Exec (tm) 9.x /10.x http://seer.support.veritas.com/docs/268722.htm