A long ago we shared a solution for "Windows 7 Lock-up While Using Windows Photo Viewer" which involved dllhost.exe's incompatibility with Kaspersky Antivirus. I recently faced a similar issue where Microsoft's genuine dllhost.exe file was constantly using 25% of CPU with ever increasing RAM (a memory leak) consumption, this time it was not the Kaspersky incompatibility causing the issue but a Windows 7 bug how it handles thumbnail generation. The reason for the issue was a broken video download on my Desktop, Windows was trying to generate thumbnail for that broken/incompatible video file and failing causing the constant CPU usage - the solution was to simply delete the problematic file or move it to a inner folder in which case the problem will occur only when accessing that particular folder.
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Windows 7 Network Shortcuts
On Windows 7, using the Windows key + R to bring up the Run... box and typing-in the location:
%appdata%\Microsoft\Windows\Network Shortcuts
.. You can make folders there that'll show up in "Computer", "Network Location", under your "Hard Disk Drives" & "Devices with Removable Storage" - and hopefully, store stuff here - that you'd usually keep on the desktop; avoiding such and similar issues. Not sure whether there is a Windows 8 equivalent.
Oh, there is, nice! @
http://www.hongkiat.com/blog/win7-8-my-computer-shortcuts/
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