Recently some of our user’s laptops were replaced with new laptops running Windows 7 64-bit. Right after this upgrade, some users noticed they could no longer open SharePoint 2007 libraries in explorer view and they no longer had the option to “upload multiple documents” from within the SharePoint libraries. Users with older 32-bit laptops running XP or Vista didn’t have this problem, so we knew it must be something with either Windows 7 or the 64-bit machine.
Numerous blogs recommended running a repair through Office diagnostics (Start > All Programs > Microsoft Office > Microsoft Office Tools > Microsoft Office Diagnostics ). We did this on one of the user’s new Windows 7 laptops and they still could not open SharePoint libraries in explorer view or upload multiple documents.
The problem ended up being the version of Internet Explorer. The new 64-bit Windows 7 laptop had both a 32-bit version and a 64-bit version of Internet Explorer as seen in the screen shot of the Start menu below. The default had been set as the 64-bit version. When the 32-bit version of Internet Explorer was selected, SharePoint performed as expected. The libraries could be opened in explorer view without error and the option to upload multiple documents was available.
I found lots of blog entries about different things that could cause this issue, but none that stated it might be the 64-bit version of IE.

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Thank you,
It was very useful as I don’t have win 7 and could correctly instruct my client on solving this issue.
Fantastic. Thanks.
Your solution was short and simple! Thanks.
H
I am having the same problem tried both running the Microsoft Office Diagnostics and using the 32-bit version of Internet Explorer but neither work. Is there some sort of server-side setting for enabling/disabling the ability to upload multiple documents?
Switch to IE32 then uninstall then reinstall SPD2010. Expect a round of Windows updates at next startup.
YEs, I searched everywhere, and you are 100% RIGHT: Open internet explorer as 32 bit and both explorer view and multiple docs work! THANK YOU!