Macbook Shuts Down Very Very Slowly - Help please :(

Hi, my Macbook (Snow Leopard) has been able to shut down very quickly since I purchased Snow Leopard. However, just a few days back, it started to shut down very very slowly, often "lagging" or being "stuck" at a blue page before it actually switches itself off. I checked Console & thought these messages could probably be the reason why. But then again, I deleted iAntiVirus and such messages continue to appear.
Can anyone help please? Thanks
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus * set a breakpoint in mallocerrorbreak to debug
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus iavd(236,0xb0081000) malloc: * error for object 0x12d09b0: pointer being freed was not allocated
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus * set a breakpoint in mallocerrorbreak to debug
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus iavd(236,0xb0081000) malloc: * error for object 0x12d09d0: pointer being freed was not allocated
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus * set a breakpoint in mallocerrorbreak to debug
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus iavd(236,0xb0081000) malloc: * error for object 0x12d0740: pointer being freed was not allocated
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus * set a breakpoint in mallocerrorbreak to debug
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus iavd(236,0xb0081000) malloc: * error for object 0x12d0a60: pointer being freed was not allocated
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus * set a breakpoint in mallocerrorbreak to debug
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus iavd(236,0xb0081000) malloc: * error for object 0x12d09f0: pointer being freed was not allocated
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus * set a breakpoint in mallocerrorbreak to debug
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus iavd(236,0xb0081000) malloc: * error for object 0x12d0b90: pointer being freed was not allocated
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus * set a breakpoint in mallocerrorbreak to debug
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus iavd(236,0xb0081000) malloc: * error for object 0x12d0c70: pointer being freed was not allocated
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus * set a breakpoint in mallocerrorbreak to debug
1/25/10 PM 11:01:26 [0x0-0xe00e].com.pctools.iAntiVirus iavd(236,0xb0081000) malloc: * error for object 0x12d0d00: pointer being freed was not allocated

Hi,
I removed it already, though I am not sure whether or not some parts of it might be around.

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