A normal uninstall of GTAIV will remove SecuROM related files (other than DRM license information, as explained below). You may also remove SecuROM related files by following the instructions below. Before you start the un-installation, close all programs running in the background. The link below contains a tool that removes SecuROM:
http://www.securom.com/support/SecuROM_Uninstaller.zip
Please follow these steps:
Download the ZIP file
Extract the application into a temporary folder
Launch the application and follow the instructions
A dialog box will appear; To start the SecuROM un-installation, press the <Yes> button.
** Note that you need administrator rights to run this un-installation utility.
Please note that this un-installation process will not remove the SecuROM™ DRM license information. Removing the license information may result in a lost activation, or may prevent other SecuROM protected software on your PC from working. This uninstall process allows you to remove SecuROM-related files without losing a purchased software activation.
Also note that some or all SecuROM files and registry keys may be re-created in their respective locations upon each launch of a SecuROM protected application.
Additional Information:
Further information about SecuROM can be found here: http://www.securom.com/support_faq.asp.
If you have additional questions, please send an email to: support@securom.com.