Dell Dimension 4600 running WinXP was infected with Trojan Downloader 'Win32.ZLOB.cu. Cleared Virus (I thought) but it kept re-appearing until I disabled System Restore. PC now OK and Restore re-enabled except that each bootup brings "System 32".  I do not have a Audigy Sound Card or an /L:ENG entry in MSCONFIG Start up.  Any suggestions for a novice?