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I'm using a desktop with 4GB memory (3.4 GB usable) on Intel Core-i5-2310 CPU, 32-bit Windows 10 Pro. Some times I get the error message like "Not enough memory to run this application" when I start an application. When I see Task manager, the total memory occupied by all the processes comes to 1.2 GB. And it shows around 54% memory. If that is the case the total usable memory should be only around 2.22GB (= 1.2 x 100/54). But the total usable memory is 3.4 GB. Why is Windows not using that available memory of 3.4 GB for running the application?

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    Have you disabled the swap file?
    – Mokubai
    Commented Dec 3, 2020 at 15:44
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    Perhaps not disabled, but is the size of the pagefile smaller than the total size of the memory?
    – harrymc
    Commented Dec 3, 2020 at 20:20
  • It was around 1330 MB. In the mean time, I went through some articles in the internet and as per some suggestions that I came across, I increased the Paging file size for C Drive to 5000 MB (under Custom size, for both Initial size and Maximum size). Will this be enough? Also, I have some more questions on this:- 1. The application that I executed resides in G drive. Does it mean that I should I set the page file in G drive? 2. Why does the system say "insufficient memory" when the total occupied memory as seen in the Task manager is only 54%?
    – chessling
    Commented Dec 4, 2020 at 2:01
  • Ideally, you want the pagefile settings configured to let Windows manage the size automatically so that it can increase it automatically when it needs to. Commented Dec 4, 2020 at 2:30

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