We need more details than that.. Can you please let us know when this happens, what are you doing when this happens? Also can you please provide OS and system specs. This can relate to a virus, or it could be a faulty drive. But without knowing more details its hard to say.
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.