Virtualized Version of Acrobat Reader X print square instead of char

Hi

We have a virtualized version of Adobe Reader X.

On some PC when we print a document we obtain a sheet with little square instead character (as in attached image). If I install Adobe Reader X on PC all works good.

A workaround is to set "print as image" in printer options, but it's impossible to set this option inside the ThinApp because Adobe Reader insert a registry entry for each printer configurated on the system.

isolation_full HKEY_CURRENT_USER\Software\Adobe\Acrobat Reader\10.0\General\cPrintAsImage

  Value=t0

  REG_SZ~Xerox WorkCentre 245 East on itmi1fp2#2323:4#2300

Any idea?

tnks