There does not seem to be a way to fix the files that have been affected but McAfee sent out an email today saying tha Microsoft had posted a patch to IE 7 that prevented unauthorized access via XML code.
As this has been one of the speculated methods in which hackers have caused this "file error 22001" problem (the other being a virus piggybacked on cookies), my guess is that this patch is designed to solve this issue however your files are probably gone.
You can get patch by doing Windows Update inside "TOOLS" on IE7.
Actual text from McAffe notice is below.
Best of luck
Ivan C. "Nick" Camp IV
Director of Global Operations
Wellness International Network, Ltd.
Microsoft has released a patch to address a critical remote-code-execution vulnerability in Microsoft Internet Explorer. The MS08-078 bulletin (Microsoft Internet Pointer Reference Memory Corruption Vulnerability) addresses the vulnerability for Microsoft Internet Explorer versions 5.01, 6, 7, and 8 Beta 2 running on Windows 2000 SP4, XP SP3, Server 2003 SP1, Vista SP1 and certain Server 2008 configurations.
Main threat sources: E-Mail; Locally logged-on user; Web
Threat level: Critical.
Solutions: On December 17, Microsoft released a patch to address this issue.
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