Virtual Memory Low message, when i start my computer. My computer was infected by a weird virus/trojan?

My computer was infected by a weird virus. the symptoms goes as follows:
- The system partition (C:\) get filled continuously, till there is only 3 megs or less.
- Kaspersky Internet Security goes off by itself (part by part failure)
- VIRTUAL MEMORY LOW balloon pops up telling me that my computer is outta resources.
- I can’t then SHUTDOWN nor CLOSE/OPEN progs

I’ve read 2 answers here .. they all talk about increasing the virtual memory thing .. PLZ .. this is not what i’m asking about

My question is clear .. WHAT IS THAT VIRUS & How can i remove it.

Regards

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