Problem installing 3.1.5 on vista

After about 90% of the install is complete I get a message that reads,

An error occured during the instalation of assembly component
{9BAE13A2-E7AF-D6C3-A01F-C8B3B9A1E18E}
HRESULT: 0x800736FD.

I'm running vista home premium 32bit with all firewalls and UAC off during the download and install.
What am I not seeing :confused:

Much thanks for your input
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