Frozen Computer

When we turn on computer 2 messages appear:

Registry Editor
Cannot import sys.reg. Error opening this file.

RUNDLL
Error loading "C:\WINDOWS\SYSTEM\BRIDGE.DLL"

Computer freezes everytime we try to access 'My Computer'
or 'Control Panel'

We use Lavasoft Ad-Aware6 and VET Anti-virus programmes.

Found several trojans in WINDOWS\Temporary Internet
Files\Content.IE5\GZY3QF0N\loaderadv81[1].jar

Counter.class-Java.ByteVerify.exploit trojan
Dummy.class-Java.ByteVerify.exploit trojan
Matrix.class-Java.Shinwow.W trojan
Parser.class-Java.ByteVerify.exploit trojan

Also,
some files/folders accidentally deleted:

QTW16DEL.EXE
unvise32.exe
unvise32qt.exe
iun1401.exe

Also,
when I try to access Windows Update - says Adminstrator
only.

Also,
when I try to use Windows98 CD

Fatal Exception 0E at 0028:C02BB38 in VXD IFSMGR(04) +
00012B0C

or

A mismatched Setupx.dll is loaded


PLEASE HELP!