Avast made my pic go in repair loop

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After using avast for 30 days and not enjoying the it (it would make my games lag the avast service would take 55% cpu)

I uninstalled it using uninstall a program, I did nothing else before or after that, I let it go through and it had sucsesfuly uninstalled, I then restarted my pc and have been stuck in the windows repair loop since.

[Asyn]

Follow instructions: https://www.avast.com/uninstall-utility (Run this tool for all prior installed Avast versions..!!)

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Okay you miss understood I cannot get onto my desktop, my computer doesn't get to load ever since I tried uninstalling it, I looked it up and the only way to fix my pc now is to buy a new windows disc or borrow a friends(all mine have macs) therefore I'm having to buy a windows disc for avast potentially destroying all my memory , I would not recommend this product to anyone at all

[Asyn]

See: "If you cannot  Boot the computer"
Instructions: http://forum.avast.com/index.php?topic=53253.0

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In the first line of how to fix it states "download blabla" please explain how the hell I am meant do that when my computer cannot get past repair failed. Please explain because these links you are giving me are stupid.

[Asyn]

You've to do it on another system.