Cannot access to any file after fresh installation

Hi everyone,

First of all, I don't know if this problem is Windows related or WinsetupfromUSB related. So, if needed, feel free to change the location of this post.

Anyway, after creating a bootable USB key with Windows XP SP3 on it, I tried to install it on my EEE PC. The first step seemed to run fine and during the second one (the GUI one), I had a error message about the rundll32.exe file being missing (and another one but I cannot remember its name). The error message pops up just after creating my User profile. But it did not prevent me from going on. And now, when I start Windows (after taking off the USB key), I cannot run anything. Each time, I have the same message : 'Windows cannot access specified device, path, or file.' It can be when trying to modify user accounts, changing display or running an exe. Even when trying to run an exe located on a USB (not the same one), I have this problem. What can I do ? Where does the problem come from ? I have right now spend hours googling for a solution but I found nothing. Thanks in advance for your time and your answers.

Bilbut