Did you change all 5 parts of the folder icon in the imageres.dll 3,4,5,6,162 in both System32 and SystemWOW64. It does sometimes take a while for them all to take, Rebuild the icon cache again and also delete thumbnails see if you can force them to take.
There are some folder icons in Shell32 as well but you shouldn't have to change them for this to work (I do but that's my OCD) but you could try that also.
System Manufacturer/Model Number acer aspire 5935g OS Windows 7 Home Premium x64 SP1 CPU intel(R)core(TM)2 duo CPU T6600 @ 2.20GHz Motherboard intel gm45/gm47 revision 07 Memory 3 gb ddr3 Graphics Card ati radeon hd4570/512mb Monitor(s) Displays lop156wh2-tle1 15.3 flat Screen Resolution 1366x768
Mouse Optical Hard Drives OCZ-Agility3 60gig ssd
320gig external hdd
500gig external hdd Internet Speed 30Mbps Down/30Mbps Up