Project Panel seems to be freezing when I try to make changes

I have a project that I have been working on for some time without any problems.  Now however anytime I try to make any changes in the project panel it isn't updating, i.e. of I delete a clip it still stays in, I try moving a clip, nothing.  I even tried starting a new project from scratch and it wont even let me add clips.
Any ideas on what I can do to resolve this?

Thank you for your answer.
And...Yes, i did : i inserted the install disc and started up holding the C key. Many time. But each time, the logo of install disc appeared during ten minutes and then, during the installation, he disappeared suddenly with no reason. And in  the same time the computer turn off.
The beginning of the storry : my son made long time ago (a year) the partition between Mac and Windows. Everything was fine.
Recently, He decided to give more memory space to windows.
He could do that directly (perhaps, was there a way but he did'nt know it)
For this reason, he decided to desinstall Windows in a first step before reinstalling it.
But before doing this, he decided to re install all the system, like for cleaning his computer...and then, since, it's a big mess.
You know everythin now.
Could you help us ?
Thanks by advance.

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