Cannot install Adobe AIR?

I am having huge problems with Adobe AIR. I couldn't update, so spent literally hours trying to uninstall v3.4 and finally got it uninstalled using IoBit. Now I can’t install v3.5. I keep being told “An error occurred while installing Adobe AIR. Installation may not be allowed by your administrator. Please contact your administrator.” I checked, and I am the only user and logged on as Administrator.

WinXP, SP3, 1.5Ghz

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