cursor is out of control, moving erratically...

Hello,

I left my Mac connected to the internet and I think it downloaded a virus.

simtoms: The cursor is moving by it's self, also cliking...

I used the Mac OS X install DVD, holding the "C" key as the computer booted. Once the computer booted from the DVD the problem ceased.

So it is a software problem.

I read the forums and I did not fin an answer that confirm solving the problem.

I resetted the PRAM holding the option, comand, P and R keys till I heard four times the boot chaim noice. I ran the Disk Utility sofrare for permits and for reparing the disk. I down loaded the trial version of MacScan and ran it. All these eforts did not fix the problem.

I have a MacBook Pro, running snow leopard 10,6,8

I am cover by apple care, my info:

Hardware Overview:

Model Name: MacBook Pro

Model Identifier: MacBookPro8,1

Processor Name: Intel Core i5

Processor Speed: 2.3 GHz

Number of Processors: 1

Total Number of Cores: 2

L2 Cache (per Core): 256 KB

L3 Cache: 3 MB

Memory: 4 GB

Boot ROM Version: MBP81.0047.B27

SMC Version (system): 1.68f98

Serial Number (system): C2******H2G

Hardware UUID:

Sudden Motion Sensor:

State: Enabled

I am in Caracas Venezuela at this time.

Regards

Alonso

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