Installing Contribute (and Studio 8) errors

[Unicorn02]

The installer goes through installing all programs in Studio 8 until it gets to
Contribute, then it stops and I get the message:
"The InstallScript engine is missing from this machine. If available, please
run ISScript.msi, or contact your support personnel for further assistance."
I am logged in as Administrator, have turned off all McAfee anti-virus
programs and the XP Firewall. I called Adobe Support 3 times on Friday
afternoon but they are now closed for the weekend. I have done what support
asked using the technote to replace and reinstall the version 10 msi. I have
now done this five times and rebooted each time. I have installed all Windows
XP Security updates and have 4G ram. I can't think of what else to try.
Can anyone help?

[Unicorn02]

Adobe support finally found a solution to this. For Windows XP and 2000

(a) You need to reinstall the IsScript engine to resolve this error. Please
refer to this InstallShield troubleshooting link for more details:

<a target=_blank class=ftalternatingbarlinklarge
href="http://consumer.installshield.com/kb.asp?id=Q108158

Please">[url]http://consumer.installshield.com/kb.asp?id=Q108158[/url]

Please</a> take note that Contribute 3 is using version 9. Follow the
instructions indicated for version 9.

(b) download Contribute 3.11 and install. (It's about 35mb in size).
<a target=_blank class=ftalternatingbarlinklarge
href="http://www.adobe.com/support/contribute/downloads.html
Download">[url]http://www.adobe.com/support/contribute/downloads.html[/url]
Download</a> the Contribute TRIAL version for 3.11 and use that to install.