[mrjapan]

My recommendation is you get a new computer altogether. Never trust relatives and never trust friends trying to sell you 2nd hand material. In fact, I recommend you trust them less than any other stranger you would buy 2nd hand material from. Next point, never buy 2nd hand computers. A new computer these days will most likely have better specs than a 2nd-hand one for a similar price. (You just need to find the right specialist shop.)

For you problem specifically, try searching for the file using the windows search utility and running it manually. If you can't find it, just find your nero files and do a manual delete of the files. As with the DVD drive, I agree with Blu.