Also, take a look at this guideline: https://searchsap.techtarget.com/feature/Troubleshooting-SAP-startup-problems-in-Windows-checklist.
The lack of memory in your system might be the culprit of the problem. Anything based on Web AS 6.20 needs much more than 128MB of RAM. Even 512MB of RAM is the bare bone minimum for a one-user test system. Also, you should consider adding more disk space and more than one disk. Performance with a single disk is terrible.
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