Files not shown in Recyle bin

Help needed .....

Files deleted are not shown in Recyle bin, even though the
desktop icon shows files in it and when I empty the bin, I
was told the number of files to be removed.

Additional information:
Recyle bin had been working fine on my PC (Windows XP)
until I noticed this problem today. Not network file
systems are involved. I was deleting files from the
internal hard drive. The only software I installed in the
last two days was Groove Workspace.

Carol