Wallpaper won't show

I have Vista home, and I have been having this problem where my desktop wallpaper won't show.
It shows up as Solid Black but When i see through my clear Vista start menu I can see the wallpaper that I have set.

Please help,

thanks

Please list machine spec when posting questions..

You don't say if your drivers are up to date?

I am pretty sure all my drivers are up to date.

and is this what you needed?

OS Name Microsoft® Windows Vista™ Home Premium
Version 6.0.6001 Service Pack 1 Build 6001
Other OS Description Not Available
OS Manufacturer Microsoft Corporation
System Name PAULWALL-PC
System Manufacturer Sony Corporation
System Model VGN-NR498E
System Type X86-based PC
Processor Intel(R) Core(TM)2 Duo CPU T5750 @ 2.00GHz, 2000 Mhz, 2 Core(s), 2 Logical Processor(s)
BIOS Version/Date Phoenix Technologies LTD R2060J9, 2/28/2008
SMBIOS Version 2.4
Windows Directory C:\Windows
System Directory C:\Windows\system32
Boot Device \Device\HarddiskVolume2
Locale United States
Hardware Abstraction Layer Version = "6.0.6001.18000"
User Name Paulwall-PC\Paul wall
Time Zone Pacific Daylight Time
Installed Physical Memory (RAM) 3.00 GB
Total Physical Memory 2.99 GB
Available Physical Memory 1.31 GB
Total Virtual Memory 6.18 GB
Available Virtual Memory 4.34 GB
Page File Space 3.28 GB
Page File C:\pagefile.sys

Thanks for the info...

So what happens if you right-click on an image and choose 'set as background'?

A solid color covers it, but i can see my icons.
Right now, Black is my background but i have one of those vista wallpapers hiding behind it.

I can see the vista wallpaper through the clear vista start menu.

Hmm.... Try this.. Go to Start > All Programs > Accessories and right-click
on the Command Prompt and choose "Run as administrator".
Type in: SFC /SCANNOW and press your Enter key.

This should repair/replace any missing or corrupt files.