My HD is shrinking/ Time Machine wont back up

So my Macbook pro has been running really slowly lately, like getting progressively worse, and now the external hard drive that I back up to time machine is spinning all the time, Time Machine wont back up, it just says "Calculating changes" and now I noticed that I have 3 less gigs on my internal HD although I have written nothing to it today. The external HD works fine other wise, I can move files manually to and from it, but I'm getting really freaked out that I maybe have a virus or something, although I have never know anyone whos had one on a mac. I have a genius bar appointment tomorrow, but I need to work on my machine now. I my main log in got so slow yesterday that it was unusable, so I created a second log in which work much faster last night, but now seems to be slowing down too. Oh, my right fan has been noisey for some time too, and my system runs at 140-160 degrees, which I have read is fairly normal, although it is often hot to the touch. Any Ideas??!?!
THB

tylerhbrown wrote:
So my Macbook pro has been running really slowly lately, like getting progressively worse, and now the external hard drive that I back up to time machine is spinning all the time, Time Machine wont back up, it just says "Calculating changes" and now I noticed that I have 3 less gigs on my internal HD although I have written nothing to it today.
That sounds like something corrupted on your internal HD. Verify it, per #A5 in Time Machine - Troubleshooting (or use the link in *User Tips* at the top of this forum). As noted there, if that shows errors, you'll have to repair it, per the yellow box there.
The external HD works fine other wise, I can move files manually to and from it,
Was that just an experiment, or are you keeping other data there, in the same partition as your Time Machine backups? If so, that's not a good idea. See #3 in Time Machine - Frequently Asked Questions (or use the link in *User Tips* at the top of this forum).

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