Md5sum is fine, the disc I used is the same one I used to install it on my mother's desktop computer, before she got a laptop which is the same model as the one I have. I got the same result on hers. My laptop has window$ 7 installed, & it seems to work fine. The disc has 2011, which was downloaded a few months ago. Here are the specs of my laptop:
Processor: Intel Core 2 Duo Dual-Core P8400 2.26 GHz
Processor Technology: Virtualization Technology, Enhanced SpeedStep Technology, EM64T, Trusted Execution Technology
Bus Speed: 1066 MHz
L2 Cache: 3 MB
Chipset: Intel GE45 Express
Standard Memory: 3 GB
Maximum Memory: 8 GB
Memory Standard: DDR3-1066/PC3-8500
Number of Memory Slots: 2
Hard Drive Capacity: 160 GB
Hard Drive Interface: Serial ATA
Hard Drive RPM: 5400
Graphic Mode: WXGA+
Display Screen Type: Active Matrix TFT Color LCD
Display Resolution: 1440 x 900
Graphics Controller: Ati Radeon HD 3470
Graphics Memory Capacity: 256 MB
Ports: 1 x IEEE 1394a - FireWire, 1 x RJ-11 Modem, 3 x 4-pin Type A USB 2.0 - USB, 1 x Mini-phone Audio In, 1 x RJ-45 Network, 1 x Mini-phone Audio Out, 1 x DC Power Input, 1 x VGA
Microsoft Windows 7Pro 64Bit
go search the forum a little.
You might try safe mode, change the boot options, or first of all make sure that your iso is okay by checking md5sum.
Does it have an OS instaled and is that one working?
What are the specs of the machine and which iso did you use?