Ok, I am trying to install RCT3 onto my emachine and about half way through the install it says the request could not be completed because of an I/o device error? Anyone help me out? My comp meets the req for the recommended system and stuff so I know its not that.

The I/O Device error is most likely a CD error not a game error.

However here is a RCT3 FAQ: http://www.frontier.co.uk/games/rct3...y_PC_run_RCT3?

As to the I/O Device error look at this:

I/O device error when trying to use your CD or DVD drive
Question:

When trying to install software using my DVD-Drive, I insert the disk in to the drive and it just spins and does nothing else. I then get an error message:

"Only part of a ReadProcessMemory or WriteProcessMemory request was completed."

What could be causing this and how can I fix it?

Answer:

The error message is caused from Windows trying to use a transfer mode that your CD/DVD drive cannot recognize.

A more common error message that is seen when this issue arises is:

"The request could not be performed because of an I/O device error."

However, both error messages yield the same solution.

To resolve this issue, you will need to change the transfer mode in your IDE channel properties. Here's how:
Go to Start
Right click My Computer
Select Manage from the resulting menu
In the Computer Management window, select Device Manager
In the right pane, click to expand IDE ATA/ATAPI controllers
Identify your CD/DVD drive in the expanded menu and right click the appropriate drive
Select Properties
In the Properties windows, click the Advanced Settings tab
In the Transfer Mode box that represents your CD/DVD drive (typically Device 1), open the drop down menu and select PIO Only
Click OK and exit all windows.
If this does not resolve your issue, then you will need to go back using the above procedure and change the Device 1 in step #9 back to "DMA if available". Then, change Device 0 to "PIO Only" in the Transfer Mode box.

Device 0: Primary IDE Channel
Device 1: Secondary IDE Channel