First, I'll recommend that you update the Java version installed on your work computer.. The Java 6 Update 23 fixes a number of vulnerablities that exist in the older versions.. (See the instructions below.) And as to there being no "Use Java...." in the "Internet Options/Advanced" tab on Vista or Windows 7, there is a reason.. Originally, when XP was first released, the was a default version of "Microsoft Java Virtual Machine" installed on each computer.. That changed when the various service packs were released, for a number of reasons, but it explains why the CHECK box still resides in the "Advanced" tab on Windows XP.
In addition, the newer versions of Java update by automatically unistalling most of the older versions.. After an update, an old version should NOT reside on the computer because it continues to leave possible security vulnerabilities. So, if you've got admin access to your work computer, please follow the steps below to install the new and uninstall the old versions of Java:
Click on the link to Sun's Java below, then scroll down to the ''Java Platform Standard Edition JDK 6 Update 23 (JDK or JRE)'' section, then click on the "Download JRE" button. Follow the prompts, select the Windows platform and the "Language", if necessary, accept the license agreement, click the "Continue" button, then download the full ''Windows OFFLINE Installation'' file to your desktop,(about 15 MB), scan it with your antivirus (just to be sure it's clean). Once that's done, if you've already got a Sun Java version on the computer, open the Control Panel, double click on the ''Add/Remove Programs'' section, then uninstall all previous versions of the J2SE Java listed there. Once that's done, then install Java JRE 6u23 from the downloaded installer.
Hope this helps.