Hi, looks like your Windows has been corrupted. In this case you can install new Windows VM and save your file from the corrupted VM using this KB article
It was big the first time and then it became small. I did everything and installed it by using the copy thingie, but it had still the same error. What do I do now?
Was the the Windows installation successful? What is the installation source (ISO, CD/DVD)? Let us know the PVM size, which is located under Documents> Parallels folder.