Using a Dell Inspiron 1545 laptop that's about two years old.
I was previously running Vista and decided a few weeks ago to upgrade to Windows 7. Everything was working fine for about a week. One morning I turn on my computer and I find a dialogue window saying that Windows has detected that I was not running a genuine copy of Windows 7 (not true.) My desktop wallpaper was gone, replaced with a black background with a similar message in the bottom right corner.
I immediately started having performance issues. Specifically, a few second after turning on my computer, the screen would go dim, almost black. I could barely make out the same dialogue box that I described earlier. I would have to reboot my computer until the dimming issue went away.
After about a week of this, Windows would not boot at all. Initially, I will get a screen giving me the option of "Launch Startup Repair" and "Start Windows Normally." If I choose startup repair, I'll get the screen that says "Windows is loading files..." at the bottom. Immediately after, it looks like Windows is booting, and then the screen goes black.
If I choose "Start Windows Normally," I get the "Starting Windows" screen with the Windows 7 logo, and after about thirty seconds, the computer reboots.
I've tried to reinstall Windows from my original disc. After the "loading files" screen, I get the Windows boot screen, followed by a black screen 30 seconds later.
I cannot start the computer in safe mode. I cannot start the computer from the last known good configuration. Either of these options end up the same way.
I've reset the bios, no dice.
Does anyone have any additional suggestions? I'm not incredibly computer saavy, just as a heads up.
Thanks in advance for any help.