1st, make darn sure you order and receive a PATA hard drive, not SATA. Western Digital has both in their Scorpio Blue line.
2nd, if your laptop isn't running BIOS version A07, go to Dell.com and download the update. You can run it from within Windows. Just make sure it's connected to wall power.
3rd, go to Start -> Run, type in CMD and hit Enter. At the command prompt, type in chkdsk C: /f to repair any corrupted files. You really should run chkdsk C: /r to do the above and also scan the surface area of your current drive. This is just to make sure the data you clone over to your new drive is in the best shape possible, but if your drive is failing, you won't want to strain it that much. Just do the /f at least once.
Once you do all that, you should be good to proceed. Looking at the Acronis manual, I don't think there's any reason to create bootable media. It looks like the drive cloning is all done under Windows but I could be wrong.