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MS SQL Server 2008 R2. Unable to launch anything with Installation Center

I'm trying to add an additional instance to MS SQL Server 2008 R2 SP2 (10.50. 4000.0) on Windows SBS 2011 Standart SP1. But clicking on any option (except help links) in the Installation Center does nothing. There's only a quickly flashing cmd window and log files with the following strings:

06/03/2013 09:29:02.319 ======================================================================
06/03/2013 09:29:02.352 Setup launched
06/03/2013 09:29:02.362 Attempting to determine media source
06/03/2013 09:29:02.372 Media source: C:\SQLServer2008R2SP2-KB2630458-x64-RUS\
06/03/2013 09:29:02.383 Attempt to determine media layout based on file 'C:\SQLServer2008R2SP2-KB2630458-x64-RUS\mediainfo.xml'.
06/03/2013 09:29:02.430 Media layout is detected as: Core
06/03/2013 09:29:02.470 Not a slip stream media, so continuing to run setup.exe from media.
06/03/2013 09:29:02.481 /? or /HELP or /ACTION=HELP specified: false
06/03/2013 09:29:02.489 Help display: false
06/03/2013 09:29:02.497 Checking to see if we need to install .Net version 3.5
06/03/2013 09:29:02.505 Checking to see if we need to install MSI version 4.5
06/03/2013 09:29:02.516 RedistMSI::GetExpectedBuildRevision - Setup expects MSI 4.5.6001.22159 at the minimum
06/03/2013 09:29:02.528 Attempting to get Windows Installer version
06/03/2013 09:29:02.545 Windows Installer version detected: 5.0.7601.17807
06/03/2013 09:29:02.555 RedistMSI::IsVistaRTM - Not Vista RTM build
06/03/2013 09:29:02.561 Required version of Windows Installer is already installed
06/03/2013 09:29:02.569 .Net version 3.5 is already installed.
06/03/2013 09:29:02.611 Windows Installer version 4.5 is already installed.
06/03/2013 09:29:02.625 Current running setup.exe full path: C:\SQLServer2008R2SP2-KB2630458-x64-RUS\setup.exe
06/03/2013 09:29:02.635 Media setup.exe file version detected: 2009.100.4000.0
06/03/2013 09:29:02.644 Locally installed setup.exe full path: C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\SQLServer2008R2\setup.exe
06/03/2013 09:29:02.652 Local setup.exe file version detected: 2009.100.4000.0
06/03/2013 09:29:02.659 Local setup.exe version 2009.100.4000.0 is equal or greater than media version 2009.100.4000.0, so re-launching setup.exe from local
06/03/2013 09:29:02.670 Media source: C:\SQLServer2008R2SP2-KB2630458-x64-RUS\
06/03/2013 09:29:02.683 Install media path: C:\SQLServer2008R2SP2-KB2630458-x64-RUS\x64\setup\
06/03/2013 09:29:02.721 Media layout: Core
06/03/2013 09:29:02.733 Attempting to get execution timestamp
06/03/2013 09:29:02.762 Timestamp: 20130603_092902
06/03/2013 09:29:02.776 Attempting to launch local setup.exe
06/03/2013 09:29:02.793 Attempting to launch process C:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\SQLServer2008R2\setup.exe
06/03/2013 09:29:15.395 Process returned exit code: 0x80070057
06/03/2013 09:29:15.413 Local setup.exe returned exit code: 0x80070057
06/03/2013 09:29:15.439 Setup closed with exit code: 0x84C40013
06/03/2013 09:29:15.449 ======================================================================

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Launching setup.exe from media source works but it only lets upgrading existing instances which I've already done.
What is wrong?
Thank you.