(issue143) Only show warning when multiple users exist. This enumerates the ProfileList registry key and looks for SID's starting with S-1-5-21- (like the certificate installer does) and count the users. Only when more then one users are found the warning is shown. Otherwise the nss-installer will be removed.

aheinecke@intevation.de=Andre Heinecke
andre.heinecke@intevation.de=Andre Heinecke
bernhard@intevation.de=Bernhard Reiter
rrenkert@intevation.de=Raimund Renkert
wilde@intevation.de=Sascha Wilde
emanuel@intevation.de=Emanuel Schütze