System path emptied by installer 1.5.7 on windows

My system path used to contain a whole bunch of stuff. Now, all that is left is the groovy path! Makes me very sad.

Path before:

Path=C:\Program Files\PC Connectivity Solution\;c:\Program Files\Apache Software Foundation\apache-maven-2.0.9\bin;C:\Program Files\Internet Explorer;;C:\WINDOWS\system32
;C:\WINDOWS;C:\WINDOWS\System32\Wbem;c:\Program Files\Hewlett-Packard\IAM\bin;c:\Program Files\ActivIdentity\ActivClient\;C:\Program Files\BEA Systems\TUXEDO\bin;C:\Progr
am Files\Rational\ClearCase\bin;C:\Program Files\Rational\common;C:\Program Files\maven-2.0.7\bin;C:\Program Files\Java\jdk1.5.0_11;C:\Program Files\Common Files\Teleca S
hared;C:\Program Files\Groovy\Groovy-1.5.4\bin;C:\views\johba_view\ida\java\ant\tool\bin\;C:\Program Files\TortoiseHg;C:\Program Files\MySQL\MySQL Server 5.0\bin;c:\Progr
am Files\Microsoft SQL Server\90\Tools\binn\;C:\Program Files\GnuWin32\bin;C:\Program Files\YourKit Java Profiler 7.0 RC build 2090\bin;C:\Program Files\TortoiseSVN\bin;C
:\Program Files\Perforce;C:\Program Files\Perforce\;C:\Program Files\Appupdater;c:\mingw\bin;c:\windows\system32\dns\bin;C:\Program Files\Rational\ClearCase\bin;C:\Progra
m Files\Sun\xVM VirtualBox;C:\Program Files\Nmap;C:\Program Files\QuickTime\QTSystem\

Path after:

Path=C:\Program Files\Groovy\Groovy-1.5.7\bin

And if I go to Control Panel->System->Advanced->Environment Variables I see that System variables has a path=%GROOVY_HOME%\bin