shot in the dark...
Had simililar situation with an IE update. If you can get in, maybe safe mode or multiple reboots, uninstall IE and reinstall it. I have Netscape as a secondary browswer and was able to to use this for the IE download.
or
from Dell site....
"No Desktop or Blank Desktop After Logging On to Windows 2000"
The information in this article applies to:
Microsoft Windows 2000 Server
Microsoft Windows 2000 Advanced Server
Microsoft Windows 2000 Professional
This article was previously published under Q256194
SYMPTOMS
When you log on to Windows 2000, you may see a blank desktop or no desktop. When this occurs, you can press CTRL+ALT+DELETE to start Task Manager, but Explorer.exe is not listed in the list of running tasks or processes. Starting a new instance of Explorer.exe does not resolve the issue.
CAUSE
This issue can occur if there is an older version of the Shdocvw.dll file in the %SystemRoot% folder. Because Explorer.exe is located in the %SystemRoot% folder, the search path for any called files starts in the %SystemRoot% folder before the path is searched. The default search order always looks for a called file in the folder containing the program file before searching the path to locate the file.
RESOLUTION
To resolve this issue:
Press CTRL+ALT+DELETE, and then click Task Manager.
On the File menu, click New Task (Run).
Type cmd.exe, and then press ENTER.
If necessary, change to the %SystemRoot% folder.
Rename the Shdocvw.dll file by typing ren shdocvw.dll shdocvw.old.
Restart the computer.
MORE INFORMATION
Other older files that may cause problems with Explorer.exe or the shell if they are located in %SystemRoot% folder:
Browseui.dll
Comctl32.dll
Comdlg32.dll
Mlang.dll
Ole32.dll
Oleaut32.dll
Shdocvw.dll
Shell32.dll
Shlwapi.dll
Urlmon.dll
Wininet.dll
Setupapi.dll
For additional information, click the article numbers below to view the articles in the Microsoft Knowledge Base:
162031 Blank Screen or Operating System Cannot Load Profile at Logon
255758 Error Message: Explorer.exe Has Generated Errors and Will Be Closed by Windows
249321 Unable to Log on if the Boot Partition Drive Letter Has Changed
137155 Users Without System32 Permissions Cannot Log On
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another.....
When explorer under Windows NT / Windows 2000 / Windows XP crashes, you will wind up with a blank screen with no Start button, no desktop icons, and sometimes no taskbar. No big deal. You can resolve it with a reboot. But what if you if you don't want to lose your work? I have also seen this remotely on web servers when connected with a tool like PCAnywhere. In any case, press alt-ctrl-del or for PCAnywhere or other remote tool have it generate the alt-ctrl-del sequence. If the Windows Task Manager dialog box appears, and it usually does, select the File menu and then New Task (Run). When the Create New Task dialog box appears, type in Explorer and press the OK button. Windows Explorer should restart complete with the Start button.