'User environment' on bootup?

When I switch on my computer and it boots up I get a 'user environment' notice on the screen which says "Windows cannot load the users profile but has logged you on with the default profile for the system", " Detail-the system has attempted to load or restore a file in the registry, but the specified file is not a registry file format.

It has been like this since reformatting to start afresh after having caught a virus before having any anti-virus software.

I have loaded everything onto this default profile and everything works fine, but after three months its beginning to annoy me and I wonder whether I can do anything to sort it out?

I would be most grateful if anyone can help?

Help!

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