Do I have problems with the hard drive?

Hello,

I recently noticed some strange ''changes'' with the hard drive (but it also could be the fan of the hard drive).
This happened after I started playing BF3, if that could be the cause of the problems.
The hard drive is about 4 years old.
It started with some kind of ''rattling noise''.
But it could be the hard drive that is making the noise.
When I run Advanced SystemCare 5 it sometimes, so not always shows me (after performing a deep scan) that there has been found a ''hard drive error''.
After rebooting the computer the recovery runs.
Than usually after 2 days (I deepscan the computer every day), it shows me that there has been found a ''hard drive error'' again.
And the hard drive temperature used to be around 30c, and now (though I am using Seagate tools, if that coud cause it) it is 35c.
Do I have a serious problem with my hard drive?  

Thank you for reading.