"Damaged" and now can't reinstall Air.... with "broken digital signiture"?

When I restart, a window pops up and say my Air is "damaged" and I must uninstall and reinstall the program.
(Maybe it had something to do with my having done systerm restore, but not sure).
I uninstalled but cannot reinstall it now.  I can downlaod the file, but When I click the "run", it just disappear and it is not installed.
I ran AVG in case my computer was infected.  There is no infection, but it says the Air file which I downloaded
had "broken digital signiture".  What does it mean? And why I cannot download Air ?
By the way, there are many websites I cannot go, as basic as Facebook, and very slow and layout is odd.
Is this because my not having Air?

A digital signature works by storing a numeric representation of a file or set of files called a hash. If the files are changed, the hash also changes. If your digital signature is "broken" then this could mean that the file has changed since it was signed or it could mean that you computer, in the bad state that it seems to be in, can't compute the hash correctly. I assume you have rebooted at least once.
Microsoft has an install cleanup tool,  http://support.microsoft.com/kb/290301, that sometimes helps in situations like this.
And no, the presence or absence of AIR on your system has no affect on any websites.

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