Im not sure if this has been mentioned or not, but you have to right click
on the adobe setup folder, and run it it windows xp sp 2 compatiblity mode.
I got the same error also.

"James" <minorkeys@gmail.com> wrote in message
news:e%23hnqWZNHHA.5012@TK2MSFTNGP02.phx.gbl...
> http://blogs.vertigosoftware.com/aan...sta_RTM.as px
>
> ...worked for me.
>
> "BkStCrawler" <daerob@bigfoot.com> wrote in message
> news:O9KMrBYNHHA.3312@TK2MSFTNGP03.phx.gbl...
>> Vista RC1
>>
>> When I try to install Adobe Reader 8 I get the following dialog box.
>>
>> "Windows Installer
>> (X) The Temp folder is on a drive that is full or is inaccessible. Free
>> up space on the drive or verify that you have write permission on the
>> Temp folder. [OK]"
>>
>> I can't determine what "Temp" folder this is. It appears that I have full
>> access to the "Temp" folder under my user account. My account has
>> administrative privileges and UAC is disabled.
>>
>> What should I be looking for. Thanks
>>
>> David
>
>