Prescious

Can somebody please please help me? I am trying to download the windows installer 3.1 but it keeps saying unable to download because not enough storage or something. Now I tried these steps below suggested by another site but it didn't work for me

HKEY_LOCAL_MACHINE
\SYSTEM
\CurrentControlSet
\Services
\LanmanServer
\Parameters
IRPStackSize DWORD (15)

This above has not worked for me. I have a 64bit vista under parameters they have dword which is for 32bit and qword for 64bit I chose qword but i was not able to type in IRPStactSize so I'm stuck. I just bought a pc to tv software and the requirements to watch it is that I have to have the latest media player 11 which I already have and the latest real player which I already have and .NET framework 2.0 which I already have and you have to have windows installer 3.1 which I do not have. This is the only thing preventing me from watching my pc to tv software. So can somebody help me download this windows installer 3.1 onto my 64bit machine thanks