Virtual Memory Errors

Recently I've been having virtual memory errors. I get the following errors after i restart the computer after it crashes.

rundll32.exe is corrupt
the file c:\pagefile.sys is corrupt and unreadable

When I check my virtual memory settings, it says Total paging file size for all drives is 256mb, which is really low. When i go further into the virtual memory settings, I have Custom size checked, initial size set as 2046, and max size set as 4092. At the bottom it says minimum allowed 2mb, recommended 3069mb, currently allocated 256mb.

I'm confused as to why it allocating such a small amoung when i have it set to 2046, and i'm pretty certain it's what causing my computer to crash every so often.

Thanks for the help!