Failure, need help : i tried to update Strawberry Perl naively, and broke it

[mascip]

Hi all, i did something stupid yesterday : i tried to update Strawberry Perl without switching my brain on.
I downloaded the latest version of Strawberry Perl, clicked "Install", and guessed : "Either it's going to work, or it's going to tell me in advance that it's not going to work".
Well, guess what, it didn't give me any warning, seemed to install properly, and now nothing works anymore.
* EDIT : i was wrong,

perl -e "print 'Hello'"

works properly. But

perl -e "use Data::Alias; print 'Hello'"

crashes.

Whether i try to call

>cpan

or any of my scripts, a window opens and tells me : "perl.exe has encountered a problem and needs to close. We are sorry for the inconvenience."

What can i do now to fix it all ?

I'm on Windows XP. My previous version of Perl was v5.12.3, and the one i tried to install is v5.16.2 (which is what is now indicated when i do "perl -v").

I guess i should have used something like perlbrew to avoid this problem.

Thank you for any help !