Good idea. If you can boot this computer at all now uninstall WinVNC and then open hijackthis again. Click Do A System Scan Only and, when the scan is finished, place a check next to these lines

O16 - DPF: {9522B3FB-7A2B-4646-8AF6-36E7F593073C} (cpbrkpie Control) - http://a19.g.akamai.net/7/19/7125/4021/ftp.coupons.com/v3123/cpbrkpie.cab

F2 - REG:system.ini: UserInit=F:\WINNT\system32\Userinit.exe

Click the button labled Fix Checked. Reboot.

If you are able to run hijackthis in normal mode please do so now and post a fresh log.