Cannot install Adobe Reader 11.0.09 and Asian Fonts over older versions

I'm using a script to install Adobe Reader 11.0.09 and it works sometimes, but very often, there is an error saying it cannot install it because a previous version exists.

We have to manually uninstall older versions of Adobe Reader 11 and then re-run the script and then it works.

@4628292 off

cls

start /wait msiexec.exe /i \\appserver1\Apps\AdobeReader\11.009\AcroRead.msi /qb TRANSFORMS="\\appserver1\Apps\AdobeReader\11.009\AcroRead.mst"

start /wait msiexec.exe /i \\appserver1\Apps\AdobeReader\11.009\fonts\FontPack11009_XtdAlf_Lang.msi /qb

How can we change this script so that it will force installation over any previous version?

By the way, the installation was created with Adobe Customization Wizard and has settings enabled to remove any previous versions of Adobe Reader.  So, the problem with installing over existing version could be from the Font Pack installation,