I can not right click in Delphi7 IDE, because when i click , occur error message

Question

I using Delphi 7. Until recently, it worked fine. But now, every time i do right click, I get an error that message is

"Access violation at address 735f5e37 in module 'MSVCR90.dll'. Write of address 00000000"

So, I can not do anything in delphi7 IDE for development.

Also, When I left click at menu (such as file, edit, run, tool.. etc) occur same error message.

So, I reinstall delphi7. But same occurs these error message.

Why is this happening?