[nvda] Help, a crisis!

Hello friends,
I have done something to my computer and do not know exactly what it is!  I 
believe i inadvertently made changes to the permissions on drive c:.  I am 
using windows vista 64 bit home premium edition pack1.  Now i cannot load nvda 
at all.  Whenever I click on the NVDA short cut I get this error message.
"errors occurred, the log file c:\programfiles\x86\NVDA\nvda.exe.log could not 
be opened, or no13 permission denied."  and I get only an ok button to click.  
I tried to reinstall nvda without success.  Is there a way of fixing this 
problem, or rather, undoing what I did?
I also noticed that some of the contents in my folders changed.  Now i cannot 
see any files in my music folders.  It tells me folder empty.  However, when I 
look at the properties i get the size of the folder as 115 gb,  indicating it 
has 58 files.

Any help would be extremely appreciated.
Regards,
Cris

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