Laptop Fault Trading standards are the best people to speak to as far as your rights go.
Personally I'd replace the laptop now so you stop being messed around or even worse lose all your data when it really mucks up. Go for one that has good reviews and doesn't come up with a list of faults when doing a simple Google search.
Other than those precautions the is no real way to knowing your getting a reliable model, even trusted brands design a dud every now and then.
Dave.
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My System: The Hybrid Lappy Processor(s): AMD Turion 64 x2 TL-64 2.2GHz | Motherboard: HP nForce 560 | RAM Memory: 2GB DDR2 PC2-5300 | Graphics Card(s): Nvidia 7150M Onboard Integrated | Sound Card: 5.1 Onboard Integrated | Hard Drive(s): 250GB 5400RPM SATA300 | Optical Drive(s): 18x CD/DVDRW-DL ATA | Case / PSU: Stock HP | Cooling: Stock HP | Network / Internet: 10/100 Nic / 10MB Virgin Cable | Monitor(s): 17" WXGA+ HD BrightView Widescreen | Operating System(s): Windows Vista Home Premium 32 SP1 | |