Windows 7/Laptop behaving as if ALT is Stuck

I have a Lenovo G570, running Windows 7 Home Premium 64-bit.
I first discovered this problem a few weeks ago whilst playing Heroes Of Newerth, it was behaving like ALT was being held down, I couldn't type and it was unplayable, it happened many times and it seemed to only happen during or after I had played HoN. But it gradually became worse and started happening all the time and when I hadn't been playing at all. I clean re-installed Windows 7 Home Premium twice since then and it has gotten to the point of me being unable to type to login upon restarting the computer.
It seems to stop temporarily (for only a couple of minutes) after time but doesn't stay corrected for long. When it does happen I can't type, and when I do push keys it goes to the shortcut associated with the key as if I was holding ALT (e.g pushing F brings up FIND/SEARCH) and double clicking a folder brings up the folder's Propertiesmenu.
Thanks to anyone who can help, I searched everywhere and couldn't find a solution anywhere.
Also I have taken my laptop apart as well as plugged in an external keyboard and have determined ALT is NOT being physically held down/stuck and sticky keys is definietly not on.

If you disconnect the keyboard, does the problem go away?
The reason I ask is because I had a similar issue on my Dell except it was the O button. I had gone thru the entire troubleshooting it, just as you did and had pinned it down to that key. In a fit of irritation one night trying to order a new keyboard, I pried up the key and the cap came off. When I put the cap back onto the key (took a while to figure out how) everything went back together as it was supposed to and everything worked perfectly.
The only thing that I could figure, is the way the linkage is made between the cap and the keyboard, is that the cap had come off part way and twisted the linkage pressing down on the film button underneath.
I have also fixed keyboards by removing hair (both human and pet) and food particles and just plain old dust that gets caught underneath the key. Generally it keeps the key from working, but occasionally it keeps the key depressed.
If you connect an external keyboard and disconnect the built in keyboard, if the problem goes away then it is a physical problem. If the problem stays then you have a software problem. Leaving the built in keyboard connected with an external keyboard connected will not tell you for sure what is the problem.
Hoov
Microsoft MVP - Consumer Security
SpywareHammer.com

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I have a Windows 7 laptop using I tunes 64 and all my music files are
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Windows 7/Laptop behaving as if ALT is Stuck

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