If you’re asking what PC or Laptop you want, you want a recent Intel Core i3 processor (or equivalent AMD), 8GB of RAM and a suitably sized SSD drive. If you need anymore than that, you’d already had a clue what you want.
‘Dodgy’ software keys (£3 for £300 worth of software) are dodgy you are denying organisation that spent millions, if not billions developing and supporting it a fair payment for it, you can cut it a dozen ways and rationalise it however you like, but if everyone using Office only paid £3 for it, Microsoft couldn’t afford to make or support it. However the keys usually work and most consumers face little or no chance of being caught out.
However I wouldn’t use them in an Business Capacity. Microsoft et al are hugely profitable organisations and they don’t really care about consumers, business’s pay more and are more heavily policed license infringements, even small business can, and will be made and example of. If FAST investigate your business and find you’ve stolen software they will offer you the chance to avoid a criminal investigation by way of a fine, plus you’ll be made to pay the full license cost of every bit of software you stole.
Don’t download ‘cracked’ software from torrent sites etc, you might not die, but you’ll certainly increase your chances of pain and suffering.
‘Free’ anti-virus is usually more trouble than it’s worth, if you don’t want to pay, use Windows Defender, if you do want something better, buy ESET.
Do you ‘need’ a Mac? if you have to ask, the answer is No.
Do you want a Mac? Why not, they’re lovely, well made things and highly unlikely to be infected with a virus, not because they’re special, but because they have some good fundamental security measures but mostly because there’s relatively few of them. Viruses are also blissfully rare on PCs these days. These days the greatest risk is from sophisticated phising scams.
Are they ‘better’ than PCs? No, both have their merits, if you spend Mac money on a Windows PC you’d get something absolutely lovely too, but they’re no worse either, they’re also pretty good in a small business situation now Apple and Microsoft are friends again.