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Never mind what it is. Just click browse, go to the windows folder, and get javaw.exe. Alternatively, just copy it to the system folder and it won't bother you again.
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And now YOU. If you had just read the post that said "FIX FOR 1.5 MISSING JAVAW.EXE", you wouldn't have had to post. I've seen about a 1000 posts that say theEXACT SAME THING because everybody is too ignorant to actually check.