I got 2 client computers effected with this problem.
First one came 2 days ago. No BSOD but the c0000005 error and almost no application is running. System Restore fails to work. I thought it was a virus or something. Backed up the machine, re-installed windows, restored the files and turned it back after fully updating windows.
Came another client yesterday with the same exact problem. Again, system restore fails to work and idiot me thought that it was a wide and fast spreading virus. I went through the same process. Backed up files, re-installed windows, restored the files back and after fully updating windows and dang, the problem was back again. That's when I realized it was something to do with the updates I applied.
Just wondering why the problem did not re-surfaced with the first machine when I fully updated it but it did with the second machine. I don't why. It might be related with the order of things I did.