Windows 7: [help] BSOD by iastor.sys, and now cannot enter the system at all...

recently, my Windows 7 64 bit on my asus ul30vt crashes and it reports a iastor.sys and irql request on the bluescreen...

it practically bluescreens a few minutes after logging in at the first. since many options are still open, I was solving the problem on my own, trying system repair, doing command prompt, and restoring...here are the details:

- system repair, don't found anything to be repaired

- command prompt, trying to open the files using iexplore.exe, succeeded when opening explorer, but directly fails when trying to check device management, resulting in bluescreen everytime I start safe mode w/ command prompt

- system restore, restored to the oldest option, 4 days ago, (recently installed software: camtasia, xilinx ISE, corel x4, 3 critical windows updates, no change in hardware, didn't put up any new hardware)

now, my system won't let me enter my account at all, it works only until the login menu, when it loads the desktop, suddenly, blue everywhere...and now it varies, sometimes IRQ request, sometimes page in nonpaged area (or something like that), sometimes memory_management (or something), sometimes its the iastor.sys. somteimes it's the ntfs.sys

safe mode and safe mode w/command doesn't work at all..
never tried the safe mode w/ networking since it's not connected to any network (and I don't have one)



and since I joined sevenforums after I'm unable to login, I can't install the software to extract the dumpfile...

could anyone please tell me what's happening with my laptop and how to save it?

thx in advance