You can't delete the hard drive you're currently using... You also can't put a / in the file name.
If you really want to optimize your computer to go faster then I suggest you use Windows Optimizer 2009. Here's a link to the free/shareware version (Pro is $29.99 but I'm sure you can find a crack somewhere)
Here's a pic of it running:

Here's a detailed graph of something:

Here's a picture of the 2008 version:

download:
Click here to download the 2009 VersionNote1: The link says warez, it's not warez it's the free version
Note2: Some anti-viruses will detect this as a trojan/other, It's not.