IIS-Error Resolve--Microsoft Excel cannot open or save any more documents because there is not enough available memory or disk space. • To make more memory available, close workbooks or programs you no longer need. • To free disk space, delete files you no longer need from the disk you are saving to.

For this fallow the fallowing steps-
step1 :  Go to run type dcomcnfg 
Step2:   Click >Component services >Computes >My Computer>Dcom config> and select micro soft Excel Application> 
Step3:   Right Click on Microsoft Excel Application>Properties>Give Asp.net Permissions 
Step 4: Select Identity table >Select interactive user >select ok