setup.exe crashes when downgrading gcc4

[Peter Münster]

Hello,

I've installed version 4.5.0 of gcc4-core, gcc4-g++ and libgcc1. Now I would
like to uninstall these packages or go back to version 4.3.4.

There is no possibility to uninstall these packages, when cycling in
setup.exe, there are these possibilities:
- 4.3.4-3
- source
- 4.3.4-1
- keep

So I select "4.3.4-3", and then "next". Then setup.exe crashes with this
error:
An unhandled win32 exception occurred in setup.exe [1672].

The system is Windows-XP SP3.

TIA for any help!
Peter

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