Unable to install windows 2008 r2 - Dell PowerEdge 1800 Server

It may just not be supported on that OS. Try another OS's drivers and see if it works.

Hello Jim. What exactly is the file name and extension? Do you have an antivirus installed? If so, disconnect your pc to any network and run a full scan. I do recommend MSE. Hope it helps.

2008 R2 doesnt support from RX 300 S2 Controller.

Is the cable USB or SERIAL?
make sure serial port IRQ is enabled in BIOS
ALso make sure you are using x64 and not x32 drivers for UPS
ALso try getting a USB cable to connect to your UPS device

Hello For .Net Framework 4.0 following are the pre requisite:-
System Requirements Supported Operating Systems:Windows 7;Windows Server 2003 Service Pack 2;Windows Server 2008;Windows Server 2008 R2;Windows Vista Service Pack 1;Windows XP Service Pack 3 Windows XP SP3 Windows Server 2003 SP2 Windows Vista SP1 or later Windows Server 2008 (not supported on Server Core Role) Windows 7 Windows Server 2008 R2 (not supported on Server Core Role)
Supported Architectures: x86 x64 ia64 (some features are not supported on ia64 for example, WPF)
Hardware Requirements: Recommended Minimum: Pentium 1 GHz or higher with 512 MB RAM or more Minimum disk space: x86 - 850 MB x64 - 2 GB
Prerequisites: Windows Installer 3.1 or later Internet Explorer 5.01 or later
If you fulfill above requirement then go to http://www.microsoft.com/downloads/en/details.aspx?FamilyID=9cfb2d51-5ff4-4491-b0e5-b386f32c0992&displaylang=en
and click on download, you will found other instructions over there
Good Luck, do rate the solution if got help

windows xp is an OS for regular desktops if you install it on a server you will have problems to find drivers for the different chip-sets embedded i the system board
The operating system that are supported for the server are:
» Microsoft Windows Server 2003 » Microsoft Windows Server 2003 for 64-bit Extended Systems » Microsoft Windows Server 2008 Essential Business » Microsoft Windows Server 2008 Foundation Edition » Microsoft Windows Server 2008 R2 » Microsoft Windows Server 2008 R2 Foundation Edition » Microsoft Windows Server 2008 Small Business » Microsoft Windows Server 2008 W32 » Microsoft Windows Server 2008 x64 » Red Hat Enterprise Linux 4 (AMD64/EM64T) » Red Hat Enterprise Linux 4 (x86) » Red Hat Enterprise Linux 5 Server (x86) » Red Hat Enterprise Linux 5 Server (x86-64) » SUSE Linux Enterprise Server 10 (AMD64/EM64T) » SUSE Linux Enterprise Server 10 (x86) » SUSE Linux Enterprise Server 11 (AMD64/EM64T) » SUSE Linux Enterprise Server 11 (x86)

Please see the below table to find you are on the right track.

Windows Server 2008 R2 Datacenter 2 TB
Windows Server 2008 R2 Enterprise 2 TB
Windows Server 2008 R2 for Itanium-Based Systems 2 TB
Windows Server 2008 R2 Foundation 8 GB
Windows Server 2008 R2 Standard 32 GB
Windows HPC Server 2008 R2 128 GB
Windows Web Server 2008 R2 32 GB