disabling page file may give more bsods but will indicate more it's a RAM issue. If you have huge amount of ram and don't play too old games then you may disable page file. Windows error reporting is useful but is not always needed as Hardware related issues can be diagnosed in many other ways.
For HDD scan it's better to use 3rd party tools like HDTune or even better HDD manufacturers diagnostic tool.
as [MENTION=105611]bssunilreddy[/MENTION] has already mentioned the mismatch of ram timings you better ditch the 2x 2GB ram modules for now and use the system with 2x 4gb you have. When you have time install rest of the ram modules and experiment with timing.
For HDD scan it's better to use 3rd party tools like HDTune or even better HDD manufacturers diagnostic tool.
as [MENTION=105611]bssunilreddy[/MENTION] has already mentioned the mismatch of ram timings you better ditch the 2x 2GB ram modules for now and use the system with 2x 4gb you have. When you have time install rest of the ram modules and experiment with timing.