Lilly,

Thank you for using the Dell Community Forum.
Try to stop all background applications.
(I figure you are using WinXP)
You can also upgrade your bios and reste the bios defaults.
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**Clearing the Startup Folder.**

Click on (Start,Programs,)
Find the (Startup) folder, and right click the mouse button over it.
You should get a small gray windows.
Go down to "Explore" and left click on "Explore"
You should get a "Startup" window that is split in two.
High light and delete all the icons on the right hand side of the Window.

**Using MSconfig to stop all background programs.**

Left-click on START | RUN.
Type in "msconfig" in the "Open" dialog box and left-click on "OK."
When the "System Configuration Utility" window appears, the "General" tab will be visible. Left-click on "Selective Startup."
Remove the check marks from each choice except "System.ini," by left clicking on the check marks.
Click the Startup tab.
Uncheck every entry.
Left-click on "Apply" and then left-click on "OK."
A message will appear stating that "For the changes to take place, the system must be restarted." Left-click on the "OK" button, and the system will begin the restart.

If the problem stops, then try using the steps below, to isolate the program that
is causing the problem.
Repeat the first couple steps above, but instead of un-checking the entries, re-check one entry at a time until you have identified the category that is the cause of the problem. After you have isolated the application, utility, or device driver that is causing the problem, you will be able to proceed with further troubleshooting. One of the easiest methods to attempt a resolution is to reinstall the problematic application or device driver. The entry causing the problem can be left disabled if it does not affect system operation.

**Delete old dos/legacy configuration files.**

Search the system for these files, delete them.
Autoexec.bat
Config.sys
Win.ini
-Delete "All" the files and folders in the ( C:\Windows\Temp ) and
( C:\Windows\Temporary Internet Files ) folder.
Search the system for any ( *.TMP ) files, and delete them.
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You can download the latest bios file here.

Once you have downloaded the file, put a blank formatted disk in the system.
Double click the file, and follow the prompts to create the bios upgrade disk.
Once the disk is created, leave it in the system and reboot the system.
The Bios upgrade will occur as the system boots up, and reads the disk.

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Resetting the defaults in your (System Bios).

Turn on (or restart) your system.
When the blue Dell logo appears, press Delete Key "Several Times"
If you wait too long and the operating system begins to load into memory, let the system complete the load operation. Then shut down the system and try again.
If you succeed you will get a screen that reads Dell Dimension Xps Bxxxr Setup
Once in the BIOS setup, press the F9 key, this will prompt you to Setup Default Configuration Highlight Yes and press the Enter key.

Try clearing your NVRAM.
Press the right-arrow key to move to the Advanced menu.
Select the Boot Configuration submenu by pressing Enter.
Press the down-arrow key to highlight Reset Config Data.
Press Enter to change the setting to Yes.
Press F10, it will prompt you to Save Changes and Exit, highlight Yes and press the Enter key.

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Lilly,

I apologize for providing the wrong link, the bios upgrade for the DIM_4100 is located here.