RTC 2.0 Eclipse client Installation Error,

I get 2 times the error below on 2 different machines (on each is Eclipse allready installed from other Rational products. But we want to install it in a own environment.

Sorry for the German but this is selected by the Installation Manager:

Fehler bei Installation.
Hinzufgen von org.eclipse.equinox.p2.bootstrap.repository.win32.win32.x86 3.4.200.R342_v20090122-989JESTEbig-SVaL8UJHcYBr4A63-1238190597667 komprimieren zu Repository C:\Program Files\IBM\IBMIMShared ist fehlgeschlagen.
Wiederaufnehmbarer Download fehlgeschlagen: C:\Documents and Settings\Administrator\Desktop\RTC-Eclipse-Client-2.0-Win32-Local\rtc\im-repo\parts\client\native\org.eclipse.equinox.p2.bootstrap.repository.win32.win32.x86_3.4.200.R342_v20090122-989JESTEbig-SVaL8UJHcYBr4A63-1238190597667.zip.
'org.eclipse.equinox.p2.bootstrap.repository.win32.win32.x86 3.4.200.R342_v20090122-989JESTEbig-SVaL8UJHcYBr4A63-1238190597667 komprimieren' ist nicht vorhanden (bei C:\Documents and Settings\Administrator\Desktop\RTC-Eclipse-Client-2.0-Win32-Local\rtc\im-repo\parts\client\native\org.eclipse.equinox.p2.bootstrap.repository.win32.win32.x86_3.4.200.R342_v20090122-989JESTEbig-SVaL8UJHcYBr4A63-1238190597667.zip).

Sigi