In case you didn't read my other thread, I recently had to reinstall Mac OSX on my new MBP after installing Windows Vista on it without using bootcamp. Anyway, my computer feels slower after doing that. It's hard to describe it, everything still works the same as before, but it's just a bit jerky and slow sometimes. Is this normal? Is there any way to make it run like it's new? Also because I asked my friend to help me install Windows Vista and he doesn't know anything about Mac's he didn't realise that you have to use bootcamp to do it. Then he spent ages trying to fix it, by doing things like putting my hard drive in his computer and so on. This involved doing things to the exterior of the hard drive, such as removing the four pins on the sides and attaching sellotape so we could fit it into his computer and the remove it. He told me that Windows had corrupted a load of stuff on my hard drive, but I'm really not sure what precisely is causing me to have reduced performance. Can anyone help? Would you recommend nuking my hard drive and then install Mac OS X again?