Hi, on my systems it's running with a single set of " . The corresponding tag looks like this: <execute display='Installing ENU_Q832483_MDAC_X86 ...'> <program>%systemdrive%\install\type2\Q832483.EXE</program> <arguments>/C:"dahotfix.exe /q /n" /q:a</arguments> <hide>False</hide> <wait>true</wait> </execute> Btw, I have taken your directory settings in the above mentioned example . Hope that helps Michael