Hi Phil :)
I never install anything logged in as admin, and have never had any problems. I will try that and see if it helps. Also, could it be that it isn't working because I didn't download the legacy content? When I installed P8 I opted not to install the legacy content, and only installed the new P8 content.  Thanks

Poser 9 SR3  and 8 sr3
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Processor Type:  AMD Phenom II 830 Quad-Core
2.80GHz, 4000MHz System Bus, 2MB L2 Cache + 6MB Shared L3 Cache
Hard Drive Size:  1TB
Processor - Clock Speed:  2.8 GHz
Operating System:  Windows 7 Home Premium 64-bit 
Graphics Type:  ATI Radeon HD 4200
•ATI Radeon HD 4200 integrated graphics 
System Ram:  8GB