15 MB should not be "too large".
Do you have 32 or 64 bit Windows?
Do you have 32 or 64 bit Office?
How much RAM do you have installed?
How much RAM does excel use when you open the file.
Even if you have 64 bit Windows, Office installs 32 bit by default. 32 bit Office applications are limited to using only 2GB of RAM. Obviously the file size itself is no where near 2GB, but your formulas may be written in a way that use up RAM approaching
that limit.
First thing you can try is starting Excel in Safe Mode. This will free up a little RAM by not loading any addins. Then close the file immediately. If that works, make 2 additional copies of the file (so you have 3 in total). Keep one as untouced "original".
Open one and delete roughly the first half of the data. Close and Save. Open the other and delete the second half of the data. At least this way you can work with the data. Or is there some other way you can reduce the amount of data rows involved in calculations.
Maybe there is some "old" data you can archive and delete/
Or, assuming you have a relatively new computer with 64 bit Windows and 32 bit Office, you could try installing 64 bit Office. This will make some more RAM available to the application, hopefully avoiding the crash problem. Or you could find a friend with
64 bit Office installed to see if it will help.
Either way you should look into "optimizing" your calculations. Excel often allows you more than one way of achieving a result. Some are more efficient than others, but this difference does not show up until you have spreadsheets with "complex" computations
and lots of data. By tweaking your calculations you may be able to resume using the data as it is.
I have a large collection of articles with tips on how to optimize spreadsheets. Of course many of the tips are repeated in multiple articles. Here is a wiki with those links:
https://answers.microsoft.com/en-us/msoffice/wiki/msoffice_excel-msoffice_custom/optimize-excel-spreadsheets-and-macros/6338eeb0-7c41-4583-be88-7705f5efeb4a?tm=1486709548388
– Wiki with all of these links in it
What Version of Windows Am I Running (Win 10 - XP)
http://windows.microsoft.com/en-us/windows/which-operating-system
What Version - 6 Ways to Learn the Exact Version of Any Application You are Using
http://www.7tutorials.com/6-ways-learn-exact-version-any-application-you-are-using
What Version of Office am I running? What version of Word
http://office.microsoft.com/en-us/word-help/what-version-of-office-am-i-using-HA101873769.aspx
https://support.office.com/en-US/article/What-version-of-Office-am-I-using-932788b8-a3ce-44bf-bb09-e334518b8b19
http://www.shaunakelly.com/word/management/what-version-of-word-do-i-have.html
http://www.7tutorials.com/6-ways-learn-exact-version-any-application-you-are-using
Most people are using 1 of 3 Office versions: 2003, 2007 or 2010.
There is a major split between in the user interface between 2003 which is the “old” Menu system and 2007 which uses the “new and improved” Ribbon.
I will provide simple guidelines on how to quickly identify which version of Office you are running.
Office 365 Version and build numbers
https://technet.microsoft.com/en-ca/library/mt592918.aspx?f=255&MSPPError=-2147217396#BKMK_ByDate
The table provides a list of the version and build numbers for each update channel release. The table is ordered by release date, with the most recent release date listed first. To see this information organized by version number, refer
to the table that follows this one. The version and build number in bold text indicates the most current version and build number for that particular channel.
Understanding 64-Bit Office 2010
http://blogs.technet.com/b/office2010/archive/2010/02/23/understanding-64-bit-office.aspx
**Microsoft Office 2010 Engineering**The official blog of the Microsoft Office product development group