Desktop Freezes After Display Turned On

im using "turn off display: 1 min" setting on my power option.

after several minutes away, when i come and i "press any key" to my computer, the display turned back on, but the desktop freezes.

i can only move my mouse but i cant right or left click to my desktop. i usually wait for like 40 - 60 secs for my desktop to be responding again.

is there something wrong with my computer? cos i am doing fresh install, and didnt modify any settings yet.

i hereby conclude what makes my desktop freezes is when i checked on "auto-hide the taskbar" setting on taskbar properties and used "turn off display after" setting.

so, these are things that might happen:

1. i disabled "auto-hide the taskbar" and disabled "turn off display after"

with / without any open programs

result: desktop fine

2. i enabled "auto-hide the taskbar" and disabled "turn off display after"

with / without any open programs

result: desktop fine

3. i disabled "auto-hide the taskbar" and enabled "turn off display after"

with / without any open programs

result: desktop fine

4. i enabled "auto-hide the taskbar" and enabled "turn off display after"
with a/some open program(s)

result: desktop fine

5. i enabled "auto-hide the taskbar" and enabled "turn off display after"
without any open programs

result: desktop freezes

PS.

i havent installed the latest display driver yet. i only now have the Ati Mobility Radeon X1400 from Windows Update, the latest one. i cant find the actual driver for my video card from my manufacturer's site.