Can't open Eclipse after working with this every day

Every morning I open Eclipse on the same computer with no problems.
Today, a have got this message while trying to open Eclipse:
"A Java Runtime Environment (JRE) or Java Development Kit (JDK)
must be available in order to run Eclipse No Java virtual machine
was found after searching the following locations:
C:\Program Files\eclipse-SDK-3.5.1-win32\eclipse\jre\bin\javaw.exe
javaw.exe in your current PATH"
Environment variable JAVA_HOME I already have
What can be a problem?

jre folder was disappeared from C:\Program Files\eclipse-SDK-3.5.1-win32\eclipse\
This was a problem. I solved it already.
I do not know the reason for it and how to prevent it for the future.
Thanks

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          Re: Can't open file--"not compatible with this version"
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