Windows 7 BlueScreen problem! What's wrong with my laptop?

I was having problems with my laptop at work (it was getting too slow for no apparent reason), so they formated it and installed Windows 7 (it used to run on XP). The slowness is gone, but now I’m getting the infamous BlueScreen of death! D:

When I restart after a crash, I get an error message, with these details:

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.48
Locale ID: 2058

Additional information about the problem:
BCCode: 7f
BCP1: 00000000
BCP2: 00000000
BCP3: 00000000
BCP4: 00000000
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Anyone knows what’s up? My laptop is an HP Compaq 2710p.