Endless Bios and "windows loading files" loop

[dtleonard]

An old PC my mother had wont boot properly i put a hard drive that has Windows already installed.Does any one have any idea what it could be? Thanks in advance

 

PC specs

Intel pentium 4 2.8ghz

x2 256 MB of ram

Dell lga 775 motherboard

Raidmax 420 watt power suply

Samsung 500 GB hard drive

 

Here is a video of what its doing.

 

[Bonsai99]

i put a hard drive that has Windows already installed.

That's the problem, do a clean install on the computer that it is going to be used on.