This old thread is being resurrected because I am having exactly the same problem with my brand new Lenovo Ideapad model Y480, running Windows 7 Home, 64-bit. As described early in this thread, everything seems to function normally after minimizing or closing the My Computer folder that opens automatically at startup.
Trouble is, the fix described above did not work on my computer.
Even before I got all of my software loaded and email accounts configured, the problem began. And by the way, all of these are mainstream programs - nothing exotic - and are working perfectly in my other computers.
This new (not refurbished) computer arrived from Lenovo only three days ago. Last night I called Lenovo Tech Support, and a technician spent at least an hour working on it by remote-access. Finding no fix, he recommended a "factory reset", which put the computer back to its out-of-the-box condition.
This morning I started all over again to load my software, and the problem started again. I'm not sure it is related, but the problem began after an automatic update for one of the programs downloaded.
The second Lenovo technician is still at it after more than an hour by remote-access, and it is obvious that this is a new and unknown problem for them.
Should I just demand a replacement computer?