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Yes you need to delete the downloaded file if that file is infected.

Format your/ system it may be attacked by virus install a fresh operating system and before all install antivirus.

You need to obtain a engineering degree from a reputed institute, Experience it can be done by doing hardware engineering, software engineer etc..

If you have two computers you need to connect directly through a lan cable,if you are talking about single computer you can access all info by win 7 os