Z400 Discs with EFI partition not mounting after Win 7 Pro upgrade

HP z400: After a repair/upgrade of Win 7 Pro (64) sp1, any external disc with an EFI partition will not mount. Drive will be present in BIOS and Disc Management, though without a letter. Unable to assign a drive letter. All other discs mount correctly. Drives with EFI partition will mount on other PCs. All drivers appear to be current and fuctional.
This question was solved.
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I figured it out... after two weeks of head-scratching, I finally found the cause.
I run MacDrive 8 so i can read discs with HFS+ formatting. That program needed to be fully uninstalled and re-installed after the upgrade. I had de-activated it prior to the upgrade, but it needed more than that. Everything works now as expected.
But wouldn't it be ince if Windows would read mac discs natively?

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