Hi! HFSLIP is really a great tool. But I think I found a problem with slipstreaming IE7 with KB933566 It looks like a version of urlmon.dll in KB933566 is 6.0.2900.3121 whilst in stock original IE7 it is 7.0.5730.11 After running HFSLIP (no matter which type of IE integration) in resulting IE7_INST.EXE urlmon.dll version is 6.0.2900.3121. I think this might be the reason why, after installation with IE7SVCPACK=1, Internet Explorer doesn't work at all. It just shows an error message with possibility to send it to Microsoft. The faulting DLL name (mentioned urlmon.dll) I found in event log. Same version downgrade appears in mshtml.dll, wininet.dll and maybe others. After using IE7SLIPSTREAM=1 Internet Explorer works at first but without tabs. The error message starts appearing after logging as a different user.