Last night I downloaded a skin for my Windows XP to look like it was running Vista. It worked perfectly fine last night. I restarted it today to find that the skin no longer was working, so I tried reinstalling it. It requested that it needed to replace a file in order for it to run, I thought it was okay, so I said okay. It then told me that my "computer could be at risk" or something, so I cancelled. It wouldn't let me cancel.
So, my computer shut down. Once I restarted it, it booted up the the desktop with no taskbar, start menu, or icons. I can't even access the start menu even from the Windows key on the keyboard. I have done ctrl alt delete and brought up the Task Manager. I've tried pulling up the explorer typing it in as "explorer.exe". It tells me that it doesn't recognize it, and refuses to find it. I also tried browsing the files and deleted the files that caused the problem.
I've restarted with the F8 key to try to use safe mode and every other possible mode. None work, it still does the same thing as it does when it starts up without the F8 command.
Any help would be appreciated! Thank you.
EDIT: I'm using an E-Machines computer running Windows XP service pack 2.