Not necessarily, data1.cab is used often and not just in windows. Sounds to me like you downloaded this program and it is unable to extract these cab files. However, if it is a legitimate copy then the problem maybe with the windows installer (due to latest patches). That tends to solve alot of these problems, but if its a corrupt download wont work. Anyhow, best bet is to download the latest windows installer... just check on ms website for windows installer update.
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I am not a fast writer.
I am not a slow writer.
I am a half-fast writer.