Windows becomes blue

Details of my problem is like this. Whenever I try to download something the windows becomes blue after sometime with numerous messages in it. Go got Windows 7 ACER Laptop. Do anyone have any solution to it.
Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.768.2
Locale ID: 1033

Additional information about the problem:
BCCode: d1
BCP1: 0000000000000028
BCP2: 0000000000000002
BCP3: 0000000000000000
BCP4: FFFFF88001611B2D
OS Version: 6_1_7601
Service Pack: 1_0
Product: 768_1

Files that help describe the problem:
C:\Windows\Minidump\012412-19718-01.dmp
C:\Users\SANJEEV\AppData\Local\Temp\WER-40373-0.sysdata.xml

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What you are experiencing is known as the blue screen of death. This occurs when some kind of hardware issue takes place. It is generally caused by a failing piece of hardware, an incompatible piece of hardware, a hardware driver issue or a change in bios settings after a Win 7 installation that causes the wrong driver to be loaded during start up. Your situation is not the most common scenario. It could be that your NIC is playing up or conflicting with say a wireless setup on your laptop. It could also possibly that when you try and download the system tries to write to a particular part of your HDD which may be having issues. Test your HDD out to make sure it is functioning as it should. Make sure whatever you are using to connect to your router (unless you are using dial up) has the latest drivers and that all other network devices are turned off or disabled.

fhanks