>>If we learn to program by best practices rather than walk before you run thinking, this kind of thing would not happen, IMO.

I think we're all in agreement... but a seasoned campaigner such as yourself will agree that we can't always control the "raw product" that presents to us. There are numerous business, budgetary and technical reasons why redevelopment may not be a practical solution to this immediate crisis, in which case our urgings about best practice may come across as "shoulda, woulda, coulda". In his shoes, I think I'd do my best to figure out what is wrong on the single bad PC to avoid a risky urgent redevelopment- though in the end that may be the only alternative. Hopefully the OP will come back and tell us how he got on.