Update KB2789642 will not install----Now resolved: update finally installed. See resolution below

KB2789642 (Microsoft.Net Framework 4 on XP.....). will not install despite multiple attempts and return Error 0x643.

This update came with another 9 on Feb 12 and all the others installed properly including KB2789613 also relating to

Microsoft.Net framework 4.

I am running Windows XP professional and IE8.

Checks with McAfee and malware bytes did not detect any problems. Today I have re-installed mcafee.

I have tried several of the solutions suggested in the forum to no avail. . Also the repair option for Microsoft.net Framework 4 Client Profile

did not work. Restoring the system to previous checkpoints did solve the problem either.

I have not tried anything to do with modifying the registry as it is beyond my competence.

Need to add that I may have had some file corruption problems as checkdisk was activated at boot time.

Is this update critical to the safety of my system?

Any suggestion as to what I can do?

The following has resolved the problem:

I have downloaded the Microsoft.Net Framework Repair tool (KB article: KB2698555)

http://www.microsoft.com/en-us/download/details.aspx?id=30135&ampppud=4

The troubleshooter works in several step and after the 3rd step, I was able install the update successfully.

Thanks to all

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