maximize the window with Sysinternals Process Explorer.
I've seen this before, and am not sure the cause.
I also have free right-click utilities from WinAero Tweaker that let me
restart Explorer, and sometimes that "fixes" misbehavior in the system
tray.
https://winaero.com/downloads/winaerotweaker.zip
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Free Sysinternals Process Explorer v17.0 on my Windows 7
"missing getprocessinformation procedure in kernel32".
download an older version
https://sysinternals-suite.en.uptodown.com/windows/versions
Oy, 17.06 works on my Windows 7 x64 Pro, but I've seen
incompatibility when updating Sysinternals Suite.
I'm not sure how I resolved it, maybe update if Microsoft fixed their
own problems, but I frequently update all-purpose utilities such as
C++ and so on, using free Ninite, free PatchMyPC, and various free
giveaway utilities, so my Windows 7 may now have support that
other Windows 7 installs do not.
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Insert the drive after the second window appears. If insert the
drive to be tested before clicking the button, we need to remove
and reinsert it to allow the program to identify it.
Yes, this drives me crazy, so to speak, especially when I'm testing a
whole series of drives, and I get the sequence wrong and have to
remove and reinsert each drive twice.
But it's manageable, and I see the need to "protect" other USB storage
devices that may be attached at the same time, but that we don't want
ValiDrive to test.
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So, how are your USB drives?