I hate to recommend replacing a DLL file because you might get the wrong version. That said, you can download ole32.dll at the following URL. It belongs in c:\windows\system32. But I suggest waiting for other options from experienced Dell people.
You could have a memory or hard drive problem that caused this to pop up. You might want to check your RAM. Run memtest for a few hours. Memory test http://memtest86.com/ There is a version to create a bootable floppy diskette and/or an ISO for creating a CD.
Checking your hard drive might also be a good idea. You can find the location of diagnostics for your drive at this URL: HD Diagnostics
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