We've seen this issue periodically with Windows users. If you experience this issue, try the following workaround:
- Navigate to the folder where you have Aptana Studio installed (usually under C:\ Program Files), and find the jre folder.
- Re-name the jre folder to jre.old.
- If you have another instance of the latest JRE installed on your machine, skip to the last step.
- Download and install a new instance of the JRE from the java web page:
http://www.java.com/en/download/index.jsp.
- Start Aptana Studio.
If the above workaround does not fix the problem, please file a support ticket in ASAP.