Java recommend removal of older versions...
http://www.java.com/en/download/faq/remove_olderversions.xml
...and so do I, I have had to clean up many PCs infected by malware that got there because of Java vulnerabilities only apparent in older versions.
When taking Java updates, unless you know really need it, I do not recommend taking the Ask Toolbar (or any other software) at the same time.
Nowadays, Java updates automatically remove (at least) the previous version.
Removal instructions...
http://www.java.com/en/download/uninstall.jsp
Tricky