Right click on my computer, click manage. Select Device Manager, and then expand the IDE ATA/ATAPI controllers section. Right click on the Primary or Secondary IDE channel and select properties from the list there. Click the Advanced Settings tab and then here you are. This section will tell you what mode your computer is running in and what what options you have for changing it. Select DMA if possible or whatever and then close this channel out. Do the same for the other IDE channel and I would restart, even if it doesn't ask you to, think it does though. Check to see if anything changes after the restart.
Don't know about transfer rates and such. Depends on your drive, but I would download the free sandra benchmarks to get a rough idea of where you are at. Notice I said Rough.
Good Luck!