Need to add a WINDOWS ENVIRONMENT VARIABEL in PIDGIN

Hi,

I need to to add the following (Windows) ENVIRONMENT VARIABLE:

NSS_SSL_CBC_RANDOM_IV=0

Before Pidgin is started, this will make it possible to use the SIPE plugin, which lets Pidgin also connect to LYNC/Office Communicator.

If you want to read more about this, then check the following link:
http://sourceforge.net/p/sipe/wiki/Frequently%20Asked%20Questions/

I have already tested this with a normal installation, and indeed, this variable makes all difference!

So my question is there someway that this kan be done in the "installer.ini" or somewhere else.

Would really appreciate your help!