Windows 7: BSOD Windows 7 Ultimate 32bit is happening more than once a day

I have a problem of BSOD on my Toshiba Satellite X205-7483 with windows 7 ultimate installed. It started almost a month ago and happens at least daily now. I first noticed it when I sat down at my computer of a morning and it had restarted over night. When I log in there is always a window informing me that I had a Blue Screen crash. Here are details of the last crash:

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1033

Additional information about the problem:
BCCode: 7a
BCP1: C04499F0
BCP2: C0000185
BCP3: 39466860
BCP4: 8933E9E8
OS Version: 6_1_7601
Service Pack: 1_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\111912-51121-01.dmp
C:\Users\John\AppData\Local\Temp\WER-8029262-0.sysdata.xml

Hard disk is on its way out, rma or replace it.