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Just though i would mention it as it took me ages to find the solution on the internet for a friend.
If you have x64, Kaspersky 2009 Internet security and try downloading IE8, then after the install the sidebar will no longer work. To fix this issue, simply open a cmd prompt as Administrator and type the following.
regsvr32 jscript.dll
You may need to reboot, but afterwards your sidebar should be back in all its glory. Apparently Kaspersky block the DLL from registering, so it will probably be fixed shortly anyway.
If you have x64, Kaspersky 2009 Internet security and try downloading IE8, then after the install the sidebar will no longer work. To fix this issue, simply open a cmd prompt as Administrator and type the following.
regsvr32 jscript.dll
You may need to reboot, but afterwards your sidebar should be back in all its glory. Apparently Kaspersky block the DLL from registering, so it will probably be fixed shortly anyway.