If you search the forums, you will see this topic has been covered many times over.
Personally, I wouldnt purchase any software, apart from your windows, for your pc, and either office, or download open office which is foc.
Only purchase software for clients, on a as and when needed basis. You will have to fork out enough money, so why have it tied up in stock, which could take ages to sell.
Get yourself a few usb sticks, and load them up with the various a/v, malware packages etc. Hard drive testing tools, and take it from there.