I have two computers at home in the event one fails I always have a back up system.  Both computers are Pentium IV Processors with XP, updated with the latest versions of software below:

Internet Explorer
Firefox
Word
Excel
FrontPage
Outlook
Access
Powerpoint
QuickBooks
Adobe Photoshop
Adobe Acrobat
Amara
Dreamweaver
Virtual TimeClock
Nero
AVG Antivirus
WinRAR

Hardware Includes:
Telephone
Scanner
Printer
Digital Camera
Fax & Voicemail Services
Digital Scale
CD-RW Drive