many applications not working

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Guest

many applications are not working in my windows 2000. where i did the wrong
step i don't know. plz help me in finding it
1)I have downloaded many utilities like winzip, etc and dumped in my system
2)those are working before format
3) now i formated the partition and installed windows 2000
4) Updated windows 2000, to sp4 from "MS windows update" website.
5) used Online Free virus scanning form various antivirus solutions, like
BITDEFENDER, PANDA ANTIVIRUS, ETRUST, MCAFEE, PCCILLIN.
6) BITDEFENDER shows a file as spyware and deleted it.
PANDA shows 6 as viruses and disinfected them. ETRUST shows some as spywares
and deleted.
7) later i installed QUICK HEAL antivirus and its firewall. Quickheal
deleted 2 files as they are viruses.
thats what i did. later when i tried to install utilities i downloaded many
applications are not working, saying "program error" and "ok" button. I don't
know what that error is? and how it can be solved. i again can't format it.
please note that i have already virus checked my system before formatting and
all programs are working.
another question, where this viruses come from as i visited only MS website?
or this virus scanners wrongly assumed system files as viruses?

one of the file quick heal deleted is "LUP.exe"

please help me
 
LUP.exe is a trojan/backdoor type
Its estimated that a none firewall protected sys will be infected within
about 10mins of a broadband connection, and I've seen a dial up infected in
less than 5mins
 
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