Gateway SX 2802, Windows 7 Home Premium, Pentium Dual Core, 6 GB RAM, 64 Bit.
There are times when the system doesn't respond to mouse clicks on task bar, and most noticeably when gMail is being read on Chrome.
I can get a response from clicks if I ctrl-alt-del and start Task Manager. Something about that procedure seems to get the computer responding again.
No problems with keyboard. If clicking on gmail in Chrome doesn't work, I can still Alt-Tab to other programs.
Can't figure out what's damaged.
All MS updates have been installed.
I ran AdwCleaner and RogueKiller, which found some things, including a Chrome extension that I removed.
MalwareBytes and Microsoft Security Essentials are installed.