ISA Server 2004 Standard Edition can be removed through Add or Remove Programs in Control Panel or by using the installation media.
Click Start, select Control Panel, and click Change Or Remove Programs.
Click Change/Remove for Microsoft ISA Server 2004 as shown in Figure 2-3.
On the Welcome To The Installation Wizard For Microsoft ISA Server 2004 page, click Next.
On the Program Maintenance page, select Remove, and then click Next.
On the Generated Files Removal page, specify whether to leave the ISA log files or cache files by selecting the appropriate check boxes, and click Next.
On the Remove The Program page, click Remove.
On the Installation Wizard Completed page, click Finish.
Figure 2-3: The Change/Remove option for ISA Server 2004 in the Add/Remove Programs interface.