The I8042prt.sys is a system function driver found in Microsoft Windows
2000 and later versions for PS/2-style keyboard and mouse devices. If
I8042PRT.sys is disabled or missing from the Registry this could be the
cause. First check in Device Manager,
a black exclamation point (!) on a yellow field appears next to these
See if you can update the driver.
Lets check your registry. Here is the key:
It should be there can you check to see if it's still there? Here's how:
Click Start > Run > Type: regedit
When Registry editor opens expand local machine> system
>CurrentControlSet> Services> (Scroll down till you see
i8042prt and click on it.
And tell me what the data entries for Start (should be 1)
Then expand the i8042prt key and select "Parameter" tell me in detail
listed for the layer drivers; exactly what you see then select "Enum"
Tell me if you see a file name "1" and data:
We might have to enable or add the port.
I'd suggest running a repair if you have your windows installation disk or do System Restore in Safe Mode, if unable to do it in Normal Mode.
Try tapping F8 at startup, and from the list of startup selections,
select Safe Mode by using UP Arrow Key to go there > then hit Enter.
Try a System Restore once there, pick a Restore Point before your
problem started (if there's a restore point that goes further back prior
to your malware issue I'd suggest that restore point)
Here's how to access system restore:
Click Start > Programs > Accessories > System Tools > System Restore > pick a different time > Next > etc
If that doesn't fix it you might have some viruses and malware.
your PC and press F8 several times until the boot menu comes up. Then
select "Safe Mode with Networking". Now get some or ALL of the FREE
Download, Install and Run Malwarebytes Anti-Malware:http://majorgeeks.com/download.php?det=5756
When Installing choose the non-pro version.
Download, Unzip, Install and Run TDSSKiller:http://majorgeeks.com/Kaspersky_TDSSKiller_d6895.html
Download, Install and Run Super Anti-Spyware:http://majorgeeks.com/SUPERAntiSpyware_d5116.html
If you have an outdated Anti-virus program then Download, Install and Run Avira Anti-Virus:http://majorgeeks.com/Avira_AntiVir_Personal_-_FREE_Antivirus_d955.html
Make sure to select ALL of the "threat categories" when you install or configure Avira...If none of the above works you should seriously think about switching to a USB mouse and USB keyboard. The i8042prt.sys driver is ancient and it only controls PS/2 mice and
keyboards (Doesn't affect anything else).