Giving credit where credit is due: I found this information at the following URL:
installing iTunes - CNET Windows Vista Forums.
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When I tried to install Quicktime on Vista Home Premium, the installation wizard stalled at initiation with Error 2738.
This is because vbscript.dll is not registered.
I found this post on another site for registering vbscript.dll (the Apple suggested method did not work for me error 0x80004005 presumably because administrative power is not invoked first):
Hi, found the problem. Vista for some reason dosnt register VBScript. What you have to do is first of all find where vbscript.dll is, mine was in C:\Windows\System32, but I think it changes dependant on your version. Next you need to go to start -> accessories and the right click on command prompt and click "run as administrator", next type "cd C:\Windows\System32" (replace the dir if its differnt for you) and then type "regsvr32 vbscript.dll". It should then confirm that vbscript has been registered and everything should work. This will fix a few installs, i found the same problem with itunes as well.
Hope this helps,
Cheers,
James