After hearing of the free Windows 10 upgrade for any Windows 7 or 8 systems, I thought I would check if I was compatible. I learned that, due to not being up to date on updates, I went to check on why I was not up to date.
I discovered that I had not installed the Windows 7 Service Pack 1 for x64-Based Systems. Learning this, I had the updater start downloading the update. However, when it got to around 19% completion, the update would suddenly end and it would return with "Could not install update" with error code 80073701. I decided to dig around a little bit, and found advice to install and run the latest System Update Readiness Tool. I ran it, had my checksur.log return with no issues, then I tried updating the update again.
However, like the first time, around 19% it stopped and cancelled the update with the same error code. I decided to uninstall my versions of AVG, MBAM, and Spybot Search and Destroy, then update and scan with Windows Defender. I also learned that running a /sfcscannow (or something similar to that) would help in some extent, and that scan returned with "No Inregrity Issues".
After doing all that, I attempted to run the update again. Again, the update ran to around 19% then cancelled it and returned error code 80073701.
After spending hours attempting to troubleshoot the issue, it seems that I have not been able to find the reason why my laptop won't install the Service Pack 1 for x64-Based Systems. I am now seeing what I should do next, as troubleshooting it myself has not bore any progress so far.
My laptop is an Acer Aspire 5253, running a Windows 7 64-Bit system.