The errors then related to the infected files which may or may not be required and aren't present, the problem is that when restored they are available, but being infected can then go on to carry out their task (if avast allows them to run, which it won't because they are infected).
So in effect you have a vicious circle if you restore them (see #### below) avast will alert again, if you don't you get the windows errors of a file not being found, etc.
With this infection it may be trying to load files or take other actions, so it may have an impact on virtual memory. But if you have plenty of hard disk space left and your windows settings for Virtual Memory could be increased, see image. However I think by default that is a system managed size, mine I have set it to a custom size.
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Open the avast Chest, Infected Files section, right click on the file and select restore. avast will most certainly alert, but you can choose No Action which allows them to remain in place (where they are restored to) but not to run.
You may then be able to run DrWeb CureIt preferably the bootable CD version so windows isn't running and trying to use the files. This may or may not be 100% successful in repairing the infected files.