The Quick Books installation either removed files, or changed registry entries related to Microsoft JAVA Virtual Machine.
Most likely, the installer determined that you had an older version of JAVA that presented a security risk.
Other than being annoying, the missing DLL will not damage your computer.
Not having JAVA though, may give you problems at some web sites.
I recommend that if you want / need JAVA you download and install the latest version of JAVA for the desktop from Sun.
http://www.java.com/en/index.jsp
Chas