Hi Guys, I've managed to get a fatal BSOD on my Vista 64bit SP1 OS, and I can't boot into the OS at all. Not even safe mode works. :bang: Below is a detailed summary of the problem,etc: ISSUE DETAILS: I get the following error, just when I should be seeing the Vista logo glow: *** STOP: 0x000000.. (some hex codes here) *** win32k.sys - Address [hex codes][date stamp] WHAT CAUSED IT: I had installed "Advanced System Optimizer (v2.2)" uke2: and used it to fix registry errors and do a registry defrag. The defrag informed me that it would need to restart the system to load the new optimized registry, and I waited for it to reboot. Only in this case, I've been getting that error ever since. Nothing seems to bypass it, not even "Last Good Known Hardware config" or Safe mode. So any ideas or hints, guys? Is there anyway to salvage this OS before calling it quits and pulling out my installation disk and *shudder* do a reinstall? :banana: :wanker: All of your thoughts and assistance would be welcome. Thanks in advance.