I had no problem with the Updater on my Win7 system, so I don't think it's that. I will point out that I have UAC turned completely off to avoid any Windows nonsense about permissions. I don't know if normal UAC settings might cause problems running Java. Do you have trouble with any other Java programs? I know Sun has web-based programs you could run to test that.
Otherwise, the only time I have had problems running the updater is after running CCleaner to get rid of temporary files. Believe it or not, Java executables for a particular program may be stored in folders that are marked temporary by Windows. I had to set CCleaner to ignore Java or it would blow away the Updater every time it cleaned out the temp files.
The other possibility that comes to mind is some issue with your firewall that interferes with remote execution.
I hope this gives you some ideas to try.
-= Therendil =-
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