Here are some possible causes
Cause
This issue occurs on some systems depending on the system configuration and
privileges set for the user. Listed below are some common causes of this
error message:
1.. The user does not have administrative privileges on the machine. This
pertains to Windows NT, 2000, or XP machines.
2.. The ALLUSERS property is not set appropriately for the IsScript.msi
file. This is only true for the installation of Express 3.54 itself. Express
3.54 setup is based on InstallScript, leading to this error message.
3.. Permissions are not set appropriately on the Installer folder in the
Windows folder.
4.. An older version of InstallShield Express 3.x is installed on the
machine, and the older version fails to uninstall properly. This usually
happens when upgrading Express from an older version to a newer one.
5.. Multiple instances of files Msiexec.exe or IDriver.exe may be running
in memory.
6.. The Windows Installer Service may not be properly installed or
configured on the machine.
7.. The installation is trying to remove a file that is locked on the
machine. This issue generally occurs when setup is being removed using the
'Remove' option of the Add Remove Programs applet on Windows XP, 2000, or
ME.
Check this link, for possible solutions :
Next time, less argue, and more details, I hope this helps!
http://support.installshield.com/kb/view.asp??pcode=ALL&articleid=Q107094