PowerPoint 2007 not storing recently opened files

When you open a file, then touch the Office Button on the top left-hand side, does the document which you have open show on the right where recent/current files should be listed?

If it does, try touching the "Pin this document to the list" to show the green pin-head. Then still keeping the document open, go to PowerPoint Options and see if the option is no longer greyed-out. If it's not, select the number of files you wish to retain in the list. Sorry, I know it's a long-shot, but I am running out of ideas.

As Bugmeister suggested earlier, you could try running Office Diagnostics. I know you said that it was disabled, however perhaps you can access it as follows:

You can run Office Diagnostics from the Start menu.

• In Windows, click Start, point to All Programs, point to Microsoft Office, point to Microsoft Office Tools, and then click Microsoft Office Diagnostics.

Hopefully that will work. :)
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EDIT:
Another possibility: Right Click on a bit of space on your task bar, select properties, Select Start Menu.

Are the privacy boxes ticked? Like this...
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Yet another one to try:

Run the Detect and Repair feature

1. Click Start.
2. In Windows 7, copy and paste (or type) the following command in the Search programs and files box, and then press ENTER:
   appwiz.cpl
   If you are running Windows XP, click Run, copy and paste (or type) the following command in the Open box, and then press ENTER:
   appwiz.cpl
3. Click the name of the Microsoft Office Edition 2007 that you want to change, and then click Change.
4. Click the option Repair, and then click Continue.

The 'Change' button can be seen below...
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debdutta said:

Ah! Ultimately that worked. Thank you very much for this help, Irene. Now Office Apps are storing recent files.

Thanks Again

Result!!
I am very pleased that you have reached a successful conclusion to your problem. :)