Possible Rootkit

Here seems to be another headache awaiting me on my computer. Yesterday, doing a webroot spysweeper/antivirus scan in safe mode, it detected "System Monitor, Potentially Masked Rootkit Files". This does not appear in a normal mode scan. It also will not be quarantined. I will quarantine it, and it will seem to be quarantined, but then when I look in the quarantine it isn't there. It wont be detected on further scans in that session, but when I shut the machine off and reboot in safe mode again, I will detect it again!

There are 7 traces, I wrote them down (hopefully copied them corretly, I'll look again and get them down better soon):

HKLM/SOFTWARE/Microsoft/WBEM/WDM ll C:/Windows/System32/drivers/en-US/modem.sys.mui [modem wmi]

HKLM/SOFTWARE/Microsoft/WBEM/WDM ll C:/Windows/System32/DRIVERS/intelppm.sys [processor wmi]

HKLM/SOFTWARE/Microsoft/WBEM/WDM ll C:/Windows/System32/DRIVERS/en-US/intelppm.sys.mui [processor wmi]

HKLM/SOFTWARE/Microsoft/WBEM/WDM ll C:/Windows/System32/DRIVERS/e100b32S.sys [Ndismof Resource]

HKLM/SOFTWARE/Microsoft/WBEM/WDM ll C:/Windows/System32/drivers/dxgkrnl.sys [Mof Resource Name]

HKLM/SOFTWARE/Microsoft/WBEM/WDM ll C:/Windows/System32/drivers/sys.mui [MofResourceName]