Is Upgrading To Windows 7 Crashing My Computer

The computer I am currently using is a 4 year old HP Pavillion a6430f (specs below), built to run the 32-bit version of Vista Home Premium. In May 2011, I first installed a 64-bit edition of Windows 7 Professional - some months thereafter, I began to run into repeated BSODs (unfortunately, I never wrote down the error codes). In October, I took the computer in for servicing, and was told that the hard drive failed. After it was replaced, I reconnected my computer (now running Vista again) and immeadiately (stupidly, perhaps) reinstalled my copy of Windows 7. Within several weeks, the problem resumed.I have only recently had time to get the computer serviced again, and it has been factory-reset to 32-bit Vista with another new hard drive. I don't expect my exact issue can be troubleshooted from this information, but I'd like to eliminate one of the variables. According to the system itself (information found in Control PanelSystem and MaintenancePerformance Information and ToolsView and print details), my computer is "64-bit capable". However, as I know little about hardware and the like, I ask: Could installing 64-bit Windows 7 on an originally 32-bit Windows Vista machine be causing hard drive failure/ BSOD problems?

[code] Other information: The latest hard drive that the repair shop has placed in this machine is a ~900 GB, 3.5" 7200 RPM Seagate ST1000DM 003-9YN162. The GeForce 9400 GT was also not present in the original computer (I made sure to install the correct drivers); nor was the power supply currently in it, which is around 400 watts (100 more than NewEgg's calculator said would be necessary to power the parts currently inside). I don't know if this info is too relevant, however; I am only asking whether the change of operating system is causing a negative effect.