Are you upgrading from a previous version of Windows?
Are you installing using the Web Installer or a .ISO file you burnt to DVD?
Are there any non-essential devices attached to the system such as external hard disk or thumb drives?
If so, try disconnecting them, they might be interfering with setup.
Could you provide your complete system specifications?
If you have compatible hardware and your computer still stops responding, disable any unnecessary hardware. Remove universal serial bus (USB) devices; remove or disable network adapters, sound cards, and serial cards; and then restart the installation.
If you are using the Web Installer, try switching to the .ISO and burn to a blank DVD:
Windows 8 Consumer Preview ISO images – Download and create your bootable DVD from here:
http://www.slavasoft.com/hashcalc/ ) Install and run HashCalc, from the HashCalc "Data" box click on the navigation button to locate and select the consumer preview
.ISO file. Place a check mark on in the SHA1 box and click "Calculate". The returned hash value (not case sensitive) should match the value posted by Microsoft. This is your means of assuring the file was not corrupted during the download.
Next you need to use the .ISO file to create a bootable DVD used to install Windows 8. Another good utility for this job if you don’t already have the necessary software (Roxio Creator and Nero being two of the more common ones) is ImgBurn:
Note: Always use quality DVD+RW media and the slowest burn speed possible for your model of DVD burner to insure a good burn is achieved.
Depending on the edition you are running, you can preserve your personal files, applications and settings. Regardless of that, I strongly recommend you dual boot with your existing operating system instead of replacing it with the Windows 8 Release Preview.
The Release Preview is still under heavy development and you should not replace a production copy of Windows with it (whether that be XP, Vista or Windows 7).