Windows 7: Deleting Files

Is there anyway I can delete some files and not have them stay on my system? I plan on deleting at least 10gigs of old Music, and don't want them to stay on my Hard Drive like usual

Also, if I use Revo/PC Decrapifier, does that get rid of any pieces of the program that there is, or should I run CCleaner/Registry Cleaner as well.

For the best removal, use revno and then ccleaner for any remnants.
ccleaner was formally named crap cleaner, because that is what it does best.

You can format the drive, safe most people will not try to undelete, or you can securely delete the drive by writing 0's to the drive or you can DoD wipe the drive and then no data will be recoverable. How far do you want to go?
Active@ Kill Disk Hard Drive Eraser. Low Level Format.

By simply deleting the 10 GB of files Windows will remove the addresses of the files so that they may be overwritten. If you want securely delete the files so that they can not be read by commercial undelete programs you can use Eraser but it would take quite a long time to overwrite the files.

~Maxx~