Red - not all of these programs catch the same offenders, I'd recommend running on demand scans with an alternative to your AVG every now and again. Also something like Superantispyware to catch other stuff also. You'd be surprised at how different they are.
Matt - you can update your malwarebytes now. Use Cleaner to get rid of unwanted crap on your PC to create some space, then Defraggler to defrag, then scan again. And obviously you've backed up any important files.
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