Mobile amd sempron 3000 replacement

Short answer looks to be no.

Stuff it full of RAM and cleanup the drive to get the most out of it.

You might get a bit more performance out of it by putting a small SSD in place of the HDD but your starting to throw money better spent on something else.

Stuffing it full of RAM and cleaning up the HDD and maybe reinstalling the OS ... or going to Win7 might be the best option.

You will get a few more miles out of it I guess ... its 6 years old right?

I'd use it as a torrent box or for for a HTPC ... or give it to the wife.