auszug KNB :
This issue has been reported to Lotus Software Quality Engineering. The issue does not occur in Notes 6.x Client because the install program has been redesigned. After you install the shared piece to the network drive, create a transform file and select "The feature is installed on the local drive" for the 'Client Single Logon Feature'.
Workaround:
1. Copy the following files to the local Windows NT System32 directory (for example, C:\Winnt\System32\ ) :
NSL.EXE
NSLSVICE.EXE
NGINA.DLL
NSLINST.EXE
NNOTES.DLL
NLSCCSTR.DLL
NGINA.DLL
JS32.DLL
2. To install the Single Logon, run NSLINST -C C:\Winnt\System32.
3. Open the Windows NT Control Panel, locate Services, open Service, and you will see Lotus Notes Single Logon. Highlight it and select Start to make sure it loads correctly. If so, then restart the machine. The Lotus Notes Single Logon will load automatically.