Whenever I finish using sticky notes and I try to close it, it doesn't close.
There's always the Windows Ding sound and I can only close it from task manager.
Hello Seamii and welcome to Seven Forums. Couple of things you can try.
If this just started you could try rolling back your computer to an earlier date/time using system restore. Since sticky notes are a part of the Windows 7 system files they might have gotten damaged or corrupted in some way.
If this doesn't work (or you don't have any restore points) you could manually check for damaged or corrupt system files by running a system file checker scan from an elevated command prompt (option two.) If problems are found, run the scan 3 times and reboot the computer after each scan.