Neighbours - Josh Anderson attempts to tackle Lassiters' Amiga 500 computer virus infection problem

Chrissie (Gayle Blakeney) and Josh (Jeremy Angerson) break into Paul's office under the cover of darkness to rectify the virus issue caused by Chrissie's sister, Caroline (Gillian Blakeney). Paul didn't want to let a clueless school kid lose on his mega-advanced computer system for fear of him damaging it further so this is effectively white hat 'hacking'. Haha etc.
Swiped from episode no. 1221, original Aussie air date, 11/06/90.