Hello & Welcome Simonsiknasty,
Thanks for filling in you specs
Check in your Bios setup where you can turn ACPI "On" or "Off"
Also a lot of us have found Windows 7 installs best the first time with 2 gb ram, then the other 2gb can be added later when it is running smoothly & all needed drivers have been installed. There are a lot of great members here to help you with problems.
Just keep asking questions & giving us the best details for the situation. " Doc "