Today there was a short powercut and when I started my computer back up, everything was fine, except when I right click on my desktop and go to properties, I get this error.

http://img156.imageshack.us/img156/1928/errorberry6rp.jpg

Can anyone help me, please?
Thank you.

Look in that error report.
Most likely it has the name of that faulty DLL.
Click on Start/Run and type sfc /scannow and keep your XP-CD handy.
That should repair/replace that DLL.