Vista laptop Blue screen

[shivg33k]

I have a lenovo Y500 with vista (i have not installed SP1), my laptop recently gives me blue screen after 15 to 20 minutes when i turn it on and afterwards it works fine, but when i shut down and next day when i start the same thing happens, another problem is with firefox (2.0.0.14) when i open any web page with ".aspx" extension the browser hangs and opens unlimited number of blank new tabs and it downloads the ".aspx" page to my disk, which when i try to open with firefox it does not open.

[techtronic]

Please update your complete Hardware Config using PC Wizard Software