I had 1.5.0_01 and 1.4.2_07 installed on my Windows XP professional machine. After I uninstalled 1.5.0_01 and lauched Java Webstart I noticed that the 5.0_01 JRE was still available and could be enabled. I have attached a snap-shot to show this erroneous behavior.
###@###.### 2005-2-11 06:48:47 GMT
###@###.### 2005-2-11 06:48:47 GMT