I have a WinXP machine T500 Lenovo laptop, that which started behaving strangely. A virus scan (Avast) found some infected files and root-kit and quarantined a bunch (8) of .sys files:
afd.sys, CDROM.sys, rebook.sys, serial.sys, IPSec.sys, netbt.sys, i8042prt.sys and mrxsmb.sys.
Once rebooted, there is no keyboard and track point since i8042prt.sys is gone, there is no CDROM (CDROM.sys), and no Internet connection (IPSec.sys).
I tried restoring the missing files with the following methods (as suggested in various posts here and elsewhere): copy from another machine, use regsvr32 to register them (fails), expand from xp cd install dir, use sfc. None of these methods made any difference.
I ran various additional cleanup tools including ComboFix and TDDSKiller, but to no avail.
Additionaly the the access connections service AcSvc.exe and it's child SvcGuiHlpr.exe processes immediately begin consuming 50% CPU each choking my pc. I can only resume work by suspending them using Process Explorer.
Edited by _Adi, 04 March 2012 - 05:49 AM.