Processor Issue

Hello I've had my Dell Inspiron E1705 since October of 2006.  Since then I've been playing World of Warcraft, but I've noticed that it seems to be getting slow and slower.  Today I installed Windows Vista on to and decided to play around with some tools.  I visit Intel website and download their Intel Processor ID Utility and I get back the following test on my processor.

It clearly shows that my Intel Duo T2250 is running at a frequency of 0.79Ghz per processor instead of the listed 1.73Ghz.  Now even if I was to add up the total from each processor that would be 0.79 x 2 = 1.58Ghz still well below the listed speed.  I've contacted Intel about this and they said that you guys need to be contacted about the issue and to give advice on why its like that.

Here is the report:

Intel(R) Processor Identification Utility
Version: 4.00.20081113
Time Stamp: 2009/01/13 07:53:14
Number of processors in system: 1
Current processor: #1
Active cores per processor: 2
Disabled cores per processor: 0
Processor Name: Intel(R) Core(TM) Duo CPU T2250 @ 1.73GHz
Type: 0
Family: 6
Model: E
Stepping: 8
Revision: 39
Maximum CPUID Level: A
L1 Instruction Cache: 2 x 32 KB
L1 Data Cache: 2 x 32 KB
L2 Cache: 2 MB
Packaging: µFCPGA/µFCBGA
EIST: Yes
MMX(TM): Yes
SSE: Yes
SSE2: Yes
SSE3: Yes
SSE4: No
Enhanced Halt State: No
Execute Disable Bit: Yes
Hyper-Threading Technology: No
Intel(R) 64 Architecture: No
Intel(R) Virtualization Technology: No
Expected Processor Frequency: 1.73 GHz
Reported Processor Frequency: 0.79 GHz
Expected System Bus Frequency: 533 MHz
Reported System Bus Frequency: 531 MHz
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