Try deleting your FrostWire pref folder found in C:\Documents and Settings\*yourusername*\Application Data\FrostWire
Note: Application Data folder is hidden by default, you have to play with the menu Tools -> Folder options in Windows Explorer

Then resinstall, normally java shouldn't have been affected, but if it doesn't work after deleting prefs, uninstall Java and reinstall 1.5

Ciao

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