I cannot delete lines in excel

[Lucasw00]

I am having trouble deleting about 20 lines in my excel workbook. Every time I try to do so, excel crashes. I have tried about everything there is and still nothing works

[#2]

Are there any formulas pointing to that sheet? (do a global search for the name of the sheet and select the search in formulas option) If not, insert a new worksheet and copy the data/formulas you want to keep over to the new one and then delete the old sheet.