@Former_Older
I got an 5870 with cat 10.8 and the same catalyst install problems like you. It is caused by the windows 7 UAC, curiously not all users have this issue but a lot. Like you i tried every possible method deleting old and installing new drivers, it always failed one, twice or more times. Same with other new install procedures like flashplayer, java, audio drivers
etc.
I finally got rid of this by creating a true 'system administrator' (not the common 'administrator' account). No problems with UAC when installing via this.
Regarding issues with my 5870 i can tell the card is working well with all actual games
or programs i use, exept IL-2 Sturmovik where i still get glass parts
or turning prop disc not displayed in external view occasionally (10.8 now).
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