Hangs/Freezes when using Add/Remove Programs

My Computer

Computer Manufacturer/Model Number
Homebuild
OS
Windows 7 Ultimate 32bit
CPU
Intel Core 2 duo E8400 3.0 GHz
Motherboard
Asus P5K
Memory
2GB Corsair PC2-6400 667MHz (2 1GB sticks)
Graphics Card(s)
ATI Radeon 4650 HD (Passive Cooled)
Sound Card
E-MU 0404 USB
Monitor(s) Displays
Samsung SyncMaster 2233BW
PSU
LC Power 6420 v1.3 420 Watt
Cooling
1 120mm exhaust back, 1 140mm CPU (Scythe Shuriken)
Keyboard
Lenovo standard
Mouse
Logitech Lazer (Small USB Bluetooth)
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