BSOD and other problems after new GPU install

Hey guys.

I installed a new Gigabyte 650 1GB card in my system yesterday and after the system boot installed the 332.21 driver previously downloaded from the geforce website. I only installed the display driver and physx and unchecked NVIDIA Experience, HD Audio and 3D Vision. After the PC restarted I left it idle for 30 minutes and everything was fine. Then I restarted again and used PC for two hours but didn't run any games and also ran /sfc scannow and it showed no problems. Today I installed two games Street Fighter 4 and Street Fighter X Tekken and played SF4 for 20 mins on medium settings (GPU-Z showed average load of 31% and average temp 42%) and then I started SFxT and I was on the character select screen for 15 minutes setting up the controls when I got a KERNEL_DATA_INPAGE_ERROR BSOD. I have previously played these games on similar settings on 9500GT and GTX460 and never got a BSOD.

System specs are

Win7 Ultimate 32bit SP1
Core2Duo E8200
Gigabyte G41MT-S2PT
4GB Kingston DDR3
Xigmatek Tauro 600W

Before I installed this card everthing was working fine and since last year there was no GPU in the system and there was no previous nvidia driver installation as I had to reinstall windows when I changed the motherboard.

Few things I noticed which might be unrelated to this but did not happen during my previous GPU usage is that:

1. After the first restart when the driver install completed I got a Windows Update has finished installing updates (even though the internet was disconnected when I installed the GPU and driver) and I hadn't installed any updates since December and Windows Update was set to disable from services settings and the latest updates in the Update History are from that date. This hasn't happened again.

2. Since installing the display driver I get the 'Windows defender needs to scan your PC' message in the Action Center flagged messages a few minutes after the Action Center has started. This has never happened before after I installed NVIDIA driver but as this was the first driver that required .NET Framework 4 for NVIDIA Experience (both of which I didn't install) could this be due to the .NET4 requirement ?

3. One of my data backup HDDs was not showing up when I turned on the system today and I had to restart system. Before I installed the GPU this never happened with this HDD and I checked all cables after I installed the GPU. Also the PSU is two months old and the cables for the HDDs are also new as I changed them with the PSU.

4. I didn't uninstall the Intel GMA driver before installing the NVIDIA driver but as it caused no issues upto this BSOD it is still installed. Could that be the cause ?

I have never gotten a BSOD this soon with a new GPU and the issues I listed have never occurred before during my previous GPU usage and driver installations.

Also sorry for the long post. I have written everything unusual which I think could be the cause of or related to the BSOD.

I checked in C:\Windows but there was no dump file and no Minidump folder. I checked the settings as per the instructions in this Dump Files - Configure Windows to Create on BSOD tutorial and except for the 'Automatically Restart' option all settings were the same. I have enabled the 'Auto Restart' and will try to recreate the BSOD. On my first try the system hanged and there was no BSOD but I had to manually restart it after 10 minutes.

Please suggest any other way to check this problem.