Dropkickmurphys

I recently built a new pc for my brother, the specs are:

Gigabyte GA-EP31-DS3L
3GB RAM
Intel Pentium Dual Core E5200
coolermaster eXtreme Power 460W PSU
and an old graphics card (radeon x800)...

I am having problems installing an operating system. The computer will boot fine, but when I insert a CD to install either windows XP or Vista I will get one of a few errors, either a blue screen with a Page file error, a blue screen with a memory error or when it is installing an OS it cant copy a file accross.

The hard drive was taken from an old dell, it is a seagate 250gb... at the moment the problems point towards the HDD, but im still unsure...

does anyone have any ideas?

PS ill update this as I try things out...

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Main PC: Intel Q6600 2.4Ghz (OC @ 3.375GHz), Gigabyte P35C-DS3R motherboard, 4GB 8500 1066mhz RAM , 512MB Geforce 9800GTX+, 500GB Seagate 7,500RPM HDD, Lite-on 20x DVD+RW, OCZ GameXStream 850W PSU, CoolerMaster Black Centurian 534 Case, Samsung 19" SyncMaster 940BW monitor / Samsung 19" TV, Windows 7 Pro / XP Pro (Dual Boot)
Laptop (Acer Aspire 5720): Intel T7500 2.2GHz, Intel Graphics X3100, 2GB DDR2 Ram, 160GB HDD, 15.4" Acer CrystalBrite Monitor.
Xfire: poultrygeist Steam ID: unpdave