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Security Essentials Install error 0x80070643
Error code 0x80070643 comes up whenever I try installing Microsoft Security Essentials. I had Security Essentials installed earlier but after I used the .net cleanup tool (since I had a problem with .net) it shut down and wouldn't start back up again, so I uninstalled it.
I have also tried installing AVG Internet Security but it comes up with AVG error 0xC0070643 with error message: General internal error.
I think my computer had .net framework 3.5.1 installed before but it won't install either. I got .net framework 4 to install but it didn't help and wouldn't uninstall or repair and the updates wouldn't install for it either (windows update error 66A and 643).
Please help me