I have an old Dell 4600 model desktop with a wireless mouse & keyboard ( over 7 years old btw ).
Lately, I have been having trouble with an un-responsive, or, slow mouse. I thought it was just certain websites I frequent & thought my PC was infected,
, however, I have noticed the same trouble when I simply launch a program without IE7 launched.
With some programs it's fine. With some websites it's fine.
I don't think it's just an "old" mouse.
And of course, I did try new batteries...