In the morning, when I switched on my computer, I was faced with an error saying that winlogon.exe is missing or corrupted. I logged on to my USB OS and replaced the winlogon.exe on the computer (which was 298kb) with the one on my pendrive (which is 280kb). This method did not work. I went to EasyBCD and created a Boot Entry which allowed me to boot into my OS via the pendrive OS's bootloader. I also tried "sfc /scannow", with an administrator command prompt but that did not work either. Also, I booted off the Windows 7 installation CD and did Startup repair thrice but to no avail.
I cannot carry my pendrive with me and boot off of its bootloader, as that does not serve the purpose of a laptop; to be portable.
What can I do now?
PS: I have the ISO for Hiren's boot CD and can use that, if only I know how.
