Taskbar and Windows Problem

[diditcuy]

i got this problem a couple days ago, after finish startup/booting up my computer i'm unable to click/right click my taskbar and desktop gadget Except Desktop Shortcut. i'm also unable to minimize,restore down,close my window or change the size of my window. the only way i found to make it work like usual is using ctrl+alt+del but it kinda annoying to keep doing that, i do clean startup too it didn't work either. So anyone got the solution

Spec
pentium Dual Core 2,7 Ghz
Ram 4Gb
Vga Gt220 1gb
Hdd 250 Gb
os Windows 7 Sp1 32Bit

 

[thx1138v2]

Right click on the Start button and click on Properties. Select the Task Bar tab in the window. Adjust settings.