How to increase Page File size or Virtual Memory in Windows 10/8/7
Right click on Computer (my pc or my computer) and open Properties.
Select Advanced System Properties.
Click Advanced tab.
Under Performance, click Settings.
Under Performance Options, click Advanced tab.
Here under Virtual memory pane, select Change.
I have given you this because something may have changed the page file from
to a fixed amount. Set it to AUTO MANAGED if it isn’t. Also as said above, check your disk space. Although in theory it shouldn’t affect pagefile as that is already cordoned off space on your drive it can affect web cache and other temp cache if you have no space. I have a feeling something else is wrong though.