Error on eclipse start up - eclipse

Question

I am desperate.... no idea whats wrong. Yesterday it worked today it doesn't.
Here is the stacktrace from the logs, and it is generated before choosing the workspace:
!SESSION 2011-09-25 11:31:39.687 -----------------------------------------------
eclipse.buildId=I20090611-1540
java.version=1.6.0_27
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=sk_SK
Framework arguments: -product org.eclipse.epp.package.jee.product - clean
Command-line arguments: -os win32 -ws win32 -arch x86 -product org.eclipse.epp.package.jee.product - clean
!ENTRY org.eclipse.osgi 4 0 2011-09-25 11:31:42.718
!MESSAGE Startup error
!STACK 1
java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at org.eclipse.osgi.storagemanager.StorageManager.updateTable(StorageManager.java:511)
at org.eclipse.osgi.storagemanager.StorageManager.open(StorageManager.java:693)
at org.eclipse.osgi.internal.baseadaptor.BaseStorage.initFileManager(BaseStorage.java:213)
at org.eclipse.osgi.internal.baseadaptor.BaseStorage.initialize(BaseStorage.java:147)
at org.eclipse.osgi.baseadaptor.BaseAdaptor.initializeStorage(BaseAdaptor.java:121)
at org.eclipse.osgi.framework.internal.core.Framework.initialize(Framework.java:185)
at org.eclipse.osgi.framework.internal.core.Framework.<init>(Framework.java:157)
at org.eclipse.core.runtime.adaptor.EclipseStarter.startup(EclipseStarter.java:286)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:175)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:559)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
at org.eclipse.equinox.launcher.Main.run(Main.java:1311)

Answer 1

That is quite uncommon: bug 113596 suggests some kind of issue with Windows (but not a definitive cause).
This thread suggests:
Under the Eclipse installation directory is a folder named ...\configuration\.settings.
If you move that folder to some temporary location, will Eclipse start? (it'll rebuild the folder and at least one of the prefs files if it starts).
Considering the Eclipse used here seems quite old:
eclipse.buildId=I20090611-1540
It is not surprising that the OP lyborko reports:
Nevetherless, I downloaded latest eclipse, and it works well...