Yes you can change all that by right clicking the desktop and going to customize and in the change color window there should be another link at the bottom that will let you customize all the navigation bars and so on you speak of.
My Computer
Computer Manufacturer/Model Number
Home Brew
OS
Windows 7 Ultimate Vista Ultimate x64
CPU
Core 2 Duo E8500 3.16Ghz @ 3.8Ghz
Motherboard
eVGA 750i FTW
Memory
2x2Gigs Patriot PC2-6400 LL
Graphics Card(s)
Inno3D GeForce GTX260 216 SP
Monitor(s) Displays
ASUS VW222U 22" 2ms Response time
Screen Resolution
1680x1050
Hard Drives
SATA 150GB
SATA II 250GB
USB IDE 750GB Ext.
PSU
HYTEC 600W & Thermaltake 650W Toughpower Power Exp