Install Mathematica 5.2 on windows 7

Questions
1

Hello, I just installed Mathematica 5.2 on windows 7, where there was Mathematica 9 already installed.

Now despite working some times , Mathematica 5.2 fail to open. It opens then suddenly disappear ffrom the screen

I know it is installed correctly cause math.exe runs and gives right results.

It is driving me crazy. Is there a solution about this?

2

One possible reason for the crash is that version 5.2 reads preferences from version 9. For disabling this, evaluate the following in the version 9:

SetOptions[$FrontEnd, VersionedPreferences -> True]