Object Browser Http 404 Page Not Found

Hi,
I have successfully installed Oracle XE 10.2.0 on Windows XP. I can access the Database homepage and I am also able to navigate to the following pages from there:
- Adminstration
- SQL
- Utilities
However any attempt to access the Object Browser page results in a Http 404 error.
I also tried installing Oracle XE 10.2.0 Universal but got the same error.
Any idea how to resolve this issue?
Below is the content of the log file
Oracle Database 10g CRS Release 10.2.0.1.0 Production Copyright 1996, 2005 Oracle. All rights reserved.
[ OCRUTL][2360]u_set_comp_error: Parameter was NULL
[ OCRUTL][2360]u_set_ocr_error: Parameter was NULL
2010-05-12 21:20:19.703: [ OCROSD][2360]utgdv:1:could not open registry key SOFTWARE\Oracle\ocr os error The system could not find the environment option that was entered.
[ OCRUTL][2360]u_set_gbl_comp_error: Parameter was NULL
[ OCRUTL][2360]u_set_gbl_comp_error: Parameter was NULL
2010-05-12 21:20:19.703: [ OCRRAW][2360]proprinit: Could not open raw device
2010-05-12 21:20:19.703: [ default][2360]a_init:7!: Backend init unsuccessful : [33]
[ OCRUTL][2360]u_set_ocr_error: Parameter was NULL
2010-05-12 21:20:19.703: [ CSSCLNT][2360]clsssinit: error(33 ) in OCR initialization
[ OCRUTL][2360]u_set_comp_error: Parameter was NULL
[ OCRUTL][2360]u_set_ocr_error: Parameter was NULL
2010-05-12 21:20:21.703: [ OCROSD][2360]utgdv:1:could not open registry key SOFTWARE\Oracle\ocr os error The system could not find the environment option that was entered.
[ OCRUTL][2360]u_set_gbl_comp_error: Parameter was NULL
[ OCRUTL][2360]u_set_gbl_comp_error: Parameter was NULL
2010-05-12 21:20:21.703: [ OCRRAW][2360]proprinit: Could not open raw device
2010-05-12 21:20:21.703: [ default][2360]a_init:7!: Backend init unsuccessful : [33]
[ OCRUTL][2360]u_set_ocr_error: Parameter was NULL
2010-05-12 21:20:21.703: [ CSSCLNT][2360]clsssinit: error(33 ) in OCR initialization
[ OCRUTL][6328]u_set_comp_error: Parameter was NULL
[ OCRUTL][6328]u_set_ocr_error: Parameter was NULL
2010-05-12 21:20:26.437: [ OCROSD][6328]utgdv:1:could not open registry key SOFTWARE\Oracle\ocr os error The system could not find the environment option that was entered.
[ OCRUTL][6328]u_set_gbl_comp_error: Parameter was NULL
[ OCRUTL][6328]u_set_gbl_comp_error: Parameter was NULL
2010-05-12 21:20:26.437: [ OCRRAW][6328]proprinit: Could not open raw device
2010-05-12 21:20:26.437: [ default][6328]a_init:7!: Backend init unsuccessful : [33]
[ OCRUTL][6328]u_set_ocr_error: Parameter was NULL
2010-05-12 21:20:26.437: [ CSSCLNT][6328]clsssinit: error(33 ) in OCR initialization

As I indicated in a previous email - I am experiencing the same 404 problem on the Object Browser Button. I downloaded and installed Oracle XE on 13-aug-10 (windows 7 32 bit). I have not altered the APEX installation. I get the same problem with login under system or login under another user. The 404 occurs immediately I click the Object Browser and also occurs if I click a drop down from the Object Browser. I can use the SQL button OK - and have used SQL to create tables and insert data into them. I know that this has worked since I have looked at them in Microsoft Access via an ODBC link. But I cant look at them in Object Browser.
Any help would be appreciated

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