Hi,
1. Which registry fixing software are you using?
Method 1.
Let us run the SFC scan and verify it prevents this error to occur.
Use the System File Checker tool (SFC.exe) to determine which file is causing the issue, and then replace the file.
To do this, follow these steps:
1. Open an elevated command prompt. To do this, click Start, click All Programs, click Accessories, right-click Command Prompt, and then click Run as administrator. If you are prompted for an administrator password or for a confirmation, type the password, or click Allow.
2. Type the following command, and then press ENTER:
sfc /scannow
The sfc /scannow command scans all protected system files and replaces incorrect versions with correct Microsoft versions.

More Information about SFC scan can be found in this document:
http://support.microsoft.com/kb/929833

Method 2.
Best thing you can do is to perform a system restore just prior to the time when issue occurred.
I have listed a couple of articles which explains about System Restore in Windows 7.
System Restore: frequently asked questions
http://windows.microsoft.com/en-US/windows7/System-Restore-frequently-asked-questions
Hope this helps.

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