Most any computer built in the last few years is perfect for recording! Whether it's a PC or a Mac, you've probably got a powerful computer ready to go for your home studio. Taking the time to prepare it for recording will help you immensely down the road in terms of performance (and, as a result of smooth operations, save you plenty of time in frustration!).
Step One: Your Recording Hard Drives
Step 2: Max Out Your RAM
Step 3: On a PC? Shut Off Unnecessary Services
If you must run an anti-virus software, choose a lightweight one that doesn't constantly run in the background. Also, disable all background and taskbar services that aren't 100% necessary. Visual effects, the background image, system sounds, and other aesthetic options are resource hogs you can do without, too.
Step 4: On a Mac? Disable Dashboard & Widgets
Drop into your Terminal application (it's in Utilities), and type the following: defaults write com.apple.dashboard mcx-disabled -boolean YES followed by killall Dock.
Your Widgets aren't lost forever; you can reactivate them in Terminal by typing defaults write com.apple.dashboard mcx-disabled -boolean NO along with the killall Dock command.