Delete those by clearing the JRE cache.
To clear the Java Runtime Environment (JRE) cache:

• Click Start > Control Panel.
• Double-click the Java icon in the control panel.
• -The Java Control Panel appears.
  
• Click Settings under Temporary Internet Files.
• -The Temporary Files Settings dialog box appears.
  
• Click Delete Files.
• -The Delete Temporary Files dialog box appears.
  -There are three options on this window to clear the cache.
  • Delete Files
  • View Applications
  • View Applets
• Click OK on Delete Temporary Files window.
• -Note: This deletes all the Downloaded Applications and Applets from the cache.
  
• Click OK on Temporary Files Settings window.
• Close the Java Control Panel

You can view those instructions along with graphics Here


Your Java may be out of date.
Older versions of Java have vulnerabilities that malware can use to infect your system.
You can go here to verify if you need to update Java:
http://www.java.com/en/download/installed.jsp

Please follow either the automatic or manual Java removal and installation instructions here:
http://aumha.net/viewtopic.php?f=31&t=34354