I can't get past the mission where you have to find Dr. Gustav. Help. Thanks in advance.

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"(Windows) Computers, manufactured by companies such as IBM, Compaq, Dell, and hundreds of others are by far the most popular, with about 70 million machines in use worldwide. Macintosh fans, on the other hand, may note that cockroaches are far more numerous than humans, and that numbers alone do not denote a higher life form."