Windows 7 PC dying

So, basically my 64bit Windows 7 PC is starting to die.

It all began with BSOD's related to Kernal_Data_Inpage_Error, referencing ntfs.sys.
That only happened when I overloaded it so I figured it was due to overheating or something.

Then I installed an application called Secunia PSI to try iron out the kinks.
Then this morning I discover that it took the liberty of running windows updates and I was stuck with a new BSOD called process1_initialization_failed. After reading up on some forums that it could be linked to a file called bootcat.cache and deleting it was the best option. I booted into linux and deleted that file and I managed to get into Windows but when I turned my back discovered that the PC had restarted itself so obviously a BSOD had returned.

I don't know what to do or where to turn.

any ideas what might be causing it?
I've attached the Window Minidump file from the most recent BSOD.
Let me know what information you need from me and I'll gladly provide.

I tried Using the SF Diagnostic but it just give me an error:
"Description:
Stopped working

Problem signature:
Problem Event Name: CLR20r3
Problem Signature 01: sf_diagnostic_tool.exe
Problem Signature 02: 5.0.0.6
Problem Signature 03: 508b892b
Problem Signature 04: mscorlib
Problem Signature 05: 2.0.0.0
Problem Signature 06: 4e1511f4
Problem Signature 07: 1f6e
Problem Signature 08: 0
Problem Signature 09: System.IO.FileNotFoundException
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 7177"


Thanks

My HDD screenshots as requested:
Attachment 291206

Attachment 291207

I ran the Samsung (Now Seagate) DOS diagnostics and everything came up clean.

Ran the AV scan. Turns out I had several infections, all cleared now.
PC seems stable. Will keep you posted. Thanks