[plt-scheme] PLT-352.5 won't startup

I downloaded and installed PLT-352.5 on a windows xp home system.
When starting DrScheme, an error message is displayed and startup won't 
continue.
Never saw this problem before. My fault or a bug?
Jos Koot

collection-path: collection not found: "skipper" in any of: 
(#<path:C:\Documents and Settings\HP_Eigenaar\Application Data\PLT 
Scheme\352.5\collects> #<path:C:\Program Files\PLT-352.5\collects>)

 === context ===
C:\Program Files\PLT-352.5\collects\macro-debugger\tool.ss:44:8
c:\program files\plt-352.5\collects\mzlib\private\class-internal.ss:2380:2: 
continue-make-object
C:\Program Files\PLT-352.5\collects\mztake\debug-tool.ss:733:8
c:\program files\plt-352.5\collects\mzlib\private\class-internal.ss:2380:2: 
continue-make-object
C:\Program Files\PLT-352.5\collects\profj\tool.ss:877:8
c:\program files\plt-352.5\collects\mzlib\private\class-internal.ss:2380:2: 
continue-make-object
C:\Program Files\PLT-352.5\collects\profj\tool.ss:977:8
c:\program files\plt-352.5\collects\mzlib\private\class-internal.ss:2380:2: 
continue-make-object
c:\program files\plt-352.5\collects\mzlib\private\class-internal.ss:2380:2: 
continue-make-object
C:\Program Files\PLT-352.5\collects\profjBoxes\tool.ss:23:8
c:\program files\plt-352.5\collects\mzlib\private\class-internal.ss:2380:2: 
continue-make-object
C:\Program Files\PLT-352.5\collects\profjWizard\tool.ss:39:8
c:\program files\plt-352.5\collects\mzlib\private\class-internal.ss:2380:2: 
continue-make-object
C:\Program Files\PLT-352.5\collects\slideshow\tool.ss:526:8
c:\program files\plt-352.5\collects\mzlib\private\class-internal.ss:2380:2: 
continue-make-object
c:\program files\plt-352.5\collects\stepper\xml-tool.ss:363:8
...

((((lambda(x)((((((x x)x)x)x)x)x))
   (lambda(x)(lambda(y)(x(x y)))))
  (lambda(x)(write x)x))
 "greetings, Jos")