Quote: Originally Posted by Eatos
...When I restart my computer, a consistency check is performed almost every time!
If by this, you mean its running a filesystem check, the CHKDSK suggested by Northernsoul55 should show some bad blocks.
If it does, hate to tell you this, but that is a strong indication that your hard drive is failing. Very slow real time performance is often the result of repeated attempts to read the same sector over and over. And while that might be repaired on the fly, if it keeps happening, your drive is on its way out.
If you can find out the make and model drive, go to the manufacturer's website to see if they have a drive diagnostic utility (most do), download and install that -- and run it. IF it finds drive damage and your drive is still under warranty you might be able to get a free replacement.