App store and Mail app are crashing in my mac air 10.9.5

Question

All my apps are crashing and i am not able to open any of them . App store for Software update and Mail app, Photos app are all crashing. I have OS X 10.9.5 in my system. I removed Parallels trail version and also Clean My Mac app, Still i have the issue,Please help me to resolve the issue,

Answer 1

"CleanMyMac" purports to "clean up" "junk" files. What it really does is to corrupt the operating system and many applications.   
The first thing you need to do is remove that software according to the developer's instructions. Never install it, or anything like it, again. Then see below.
If you don't already have a current backup, back up all data, then reinstall the OS.* You don't need to erase the startup volume, and you won't need the backup unless something goes wrong. If the system was upgraded from an older version of OS X, you may need the Apple ID and password you used.
If you use FileVault 2, then before running the Installer you must launch Disk Utility and select the icon of the FileVault startup volume ("Macintosh HD," unless you gave it a different name.) It will be nested below another icon with the same name. Click the Unlock button in the toolbar and enter your login password when prompted. Then quit Disk Utility to be returned to the main Recovery screen.
There are ways to back up a computer that isn't fully functional. Ask if you need guidance.
If you installed the Java runtime distributed by Apple and still need it, you'll have to reinstall it. The same goes for Xcode. All other data will be preserved.
*The linked support article refers to OS X 10.9 ("Mavericks"), but the procedure is the same for OS X 10.7 ("Lion") and later.