Are you trying to open the InDesign file (with the extension .indd), or the PDF file you created from that InDesign file (with the extension .pdf)? If it's the InDesign file, you are in the wrong forum - try the InDesign forum instead: InDesign
If it's the PDF file, hold down the Ctrl key when you dismiss the error dialog. You will get a more technical error message. What exactly does it say?
the file was created with the extension *.indd and then created in a pdf.
So, which of these two files are you trying to open?
If there were good, there was no reason for it to break. There are, of course, the probability of viral infection and virtually zero probability of undetected error reading from disk. Try to remove/transfer the folder:
\Documents and Settings\.......\Application Data\Adobe\InDesign Your Version Adobe
Then try to open the file.
If the file is seriously damaged you will have to restore it in other ways. [ Mod: Link and description of questionable tool removed ]
I've tested a number of tools that promise to repair PDF files, and none of them was able to actually do that with damaged files. Acrobat already has a function built in that tries to repair common problems with PDF files while it's opening such a file. The only evidence you usually see is that Acrobat will prompt you to save the file even though you did not modify it. If Acrobat cannot repair a file, chances are that any of these tools will also not be able to do anything useful for you.
UPDATE: I noticed that the link to the tool was removed.
The link to the tool was removed because the website in question is illegally using the Adobe name and registered trademarks and thus raises some serious questions. As such, Adobe on its forums cannot be a party to providing publicity for this entity.