Difficulty Installing squeeze

[Ethan Rosenberg <ethros@earthlink.net>]

Dear list -

I am trying to install squeeze from Debian-6.0.1a-i386-CD-1.iso. The 
installation fails with the message "The CD-ROM" does not contain a 
valid Release file".

Here are some details of the system:

Dell Optiplex 260
2 GB RAM
1.4 GB Pentium 4
40 GB blank hard drive.

I am a newbie, so please walk me thru this.

Ethan Rosenberg