Might be caused by an ad-ware called WebSavings [WebSavings / TopMoxie]. This adds an entry in registry and loads the Java Class file present in the ad-ware's folder [at Windows startup]. This may also be caused by any other spyware. One of the most common cause I noticed is due to WebSavings / TopMoxie.
[WJView is the Microsoft command-line loader for Java and it's a legit file. You don't need to extract a new copy of this file, nor download Java VM. Spyware removers and the Anti-virus software removes the Java Class file without removing the startup entry referencing WJView. That's why the error is caused]
You may uncheck the WJView entry from MSCONFIG Startup tab. To remove the traces from the registry, start Registry Editor and browse to the following registry location:
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run]
Value: "WebSavingsfromEbates"
Data: "wjview /cp

"C:\Program Files\WebSavingsfromEbates\System\Code" Main lp: "C:\Program Files\WebSavingsfromEbates""
--------------------------------------------------------------------------------
Removal:
First, use the Control Panel Add/Remove Programs to uninstall this adware. If this does not help,
Click Start, Run and type Regedit. Press OK.
Go to this location:
[HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run]
In the right pane, delete the value called 'WebSavingsfromEbates'
Exit the registry editor and restart Windows.
Delete the following folders and subfolders:
C:\Program Files\WebSavingsfromEbates\
(Includes 3-4 subfolders)
In Internet Explorer, you will also see a right-click context-menu item named "WebSavings". Remove it using ToolbarCop.
Related Links:
http://www.kephyr.com/spywarescanner/library/websavings/index.phtml
http://www.pestpatrol.com/PestInfo/e/ebates_moneymaker.asp
From Microsoft Knowledgebase: "WJView error Could not execute main" error message when you start your Windows XP-based computer:
http://support.microsoft.com/?kbid=831427
NOTE: To remove the remnants of this spyware [if present], download Ad-Aware and update it to the current definitions using "Web Update" feature and scan.