How netsky works:

http://reviews-zdnet.com.com/4520-6600_16-5122164.html

Try Disabled NAV and see if it boots faster, if not then hmmm, see what programs are running right when you boot your computer, does it boot slow in safe mode too ? Maybe its a slow PC ....

edit: ugh, 2.1 Ghz, not the CPU than

Netsky.b then searches the infected hard drive for usable e-mail addresses.