Dears,

I have bought a new laptop, Dell XPS 14Z, 14 inch, with Windows 7 Premeium installed on it. However, I have a couple of problems from the very start which makes me regret buying it. The laptop works great, but sometimes when I try to shut it down, it doesn't. Just a blue window with shutting down sign but it never turns off perfectly.

The second problem is even deadlier. A blue screen, once a day or two days once appears and I never know why. This death screen comes from nowhere without any reason, I scanned my computer and there's no trace of virus. The only think recognizeable from the screen is this file 'tixhci.sys" file.

The laptop is very good in terms of hardware, 2.5 CPU i5, RAM 4GB, 500GB of hard drive and 1GB of display card,

Can anyone help me here? Many thanks in advance,

PS, I don't know much about BIOS, so please tell me step by stem if the problem is related to the hardware,