ciao sono nuovo e vi ringrazio anticipatamente per qualsiasi aiuto arriverà.
ho due problemi:
1- da qualche giorno mi appare una finestra all'apertura del pc indicante come titolo 001 e cliccando per chiuderla mi collega a internet più precisamente ad un sito porno, ho provato con una scansione dell'antivirus NOD32 ma non è successo nulla, ho scaricato hijackthis ma al momento di eseguirlo non parte facendo sparire la schermata per un attimo
2- provando ad installare un programma a meta mi è apparso l'errore msiexec.exe e pur riprovando più volte non sono riuscito a fare nulla
sono proprio messo male?

Direi di si! Prova in modalità provvisoria ad eseguire HijackThis,se non riesci prova a fare una scansione online con Active Scan di Panda:
http://www.pandasoftware.com/products/ActiveScan.htm
L'errore msiexec probabilmente è causato dal windows installer corrotto.Che sistema operativo hai?

windows xp

è windows xp

Se non riesci a fare le scansioni ti consiglio di salvare i dati e formattare.

ti mando lo stato della scansione di panda:
Incident Status Location

Potentially unwanted tool:application/myglobalsearch Not disinfected HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{37B85A21-692B-4205-9CAD-2626E4993404}
Adware:adware/happytofind Not disinfected Windows Registry
Adware:adware/intcodec Not disinfected Windows Registry
Adware:adware/ieloader Not disinfected Windows Registry
Potentially unwanted tool:application/kill&clean Not disinfected HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{BF69DF00-2734-477F-8257-27CD04F88779}
Adware:adware/systemdoctor Not disinfected Windows Registry
Dialer:dialer.min Not disinfected HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{DB893839-10F0-4AF9-92FA-B23528F530AF}
Adware:adware/spywaresheriff Not disinfected Windows Registry
Adware:adware/adrotator Not disinfected Windows Registry
Adware:adware/netword Not disinfected Windows Registry
Adware:adware/wetoffice Not disinfected Windows Registry
Adware:adware/spywaresoftstop Not disinfected Windows Registry
Adware:adware/mmediapd Not disinfected Windows Registry
Adware:adware/click Not disinfected Windows Registry
Adware:adware/quantos Not disinfected Windows Registry
Spyware:spyware/browseraccelerator Not disinfected Windows Registry
Adware:adware/wmmafia Not disinfected Windows Registry
Adware:adware/sinabar Not disinfected Windows Registry
Adware:adware/psic Not disinfected Windows Registry
Adware:adware/ourxin Not disinfected Windows Registry
Adware:adware/idonate Not disinfected Windows Registry
Adware:adware/eztracks Not disinfected Windows Registry
Adware:adware/roogoo Not disinfected Windows Registry
Adware:adware/targetad Not disinfected Windows Registry
Adware:adware/yazzle Not disinfected Windows Registry
Adware:adware/gator.gotsmiley Not disinfected Windows Registry
Adware:adware/spywarequake Not disinfected Windows Registry
Dialer:dialer.gun Not disinfected HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\Browser Helper Objects\{FFB51760-344E-4FFB-BFFF-4B18C7AC1D63}
Adware:adware/seekmo Not disinfected Windows Registry
Adware:adware/trustin Not disinfected Windows Registry
Adware:adware/vog Not disinfected Windows Registry
Adware:adware/emediacodec Not disinfected Windows Registry
Virus:trj/spamer.t Disinfected Operating system
Spyware:Cookie/2o7 Not disinfected C:\Documents and Settings\Luca\Cookies\luca@2o7[1].txt
Spyware:Cookie/Falkag Not disinfected C:\Documents and Settings\Luca\Cookies\luca@as1.falkag[1].txt
Spyware:Cookie/Atlas DMT Not disinfected C:\Documents and Settings\Luca\Cookies\luca@atdmt[2].txt
Spyware:Cookie/Serving-sys Not disinfected C:\Documents and Settings\Luca\Cookies\luca@bs.serving-sys[2].txt
Spyware:Cookie/Doubleclick Not disinfected C:\Documents and Settings\Luca\Cookies\luca@doubleclick[1].txt
Spyware:Cookie/HotLog Not disinfected C:\Documents and Settings\Luca\Cookies\luca@hotlog[1].txt
Spyware:Cookie/Mediaplex Not disinfected C:\Documents and Settings\Luca\Cookies\luca@mediaplex[1].txt
Spyware:Cookie/Serving-sys Not disinfected C:\Documents and Settings\Luca\Cookies\luca@serving-sys[1].txt
Spyware:Cookie/Tradedoubler Not disinfected C:\Documents and Settings\Luca\Cookies\luca@tradedoubler[1].txt
Spyware:Cookie/Yadro Not disinfected C:\Documents and Settings\Luca\Cookies\luca@yadro[1].txt
Spyware:Cookie/Zedo Not disinfected C:\Documents and Settings\Luca\Cookies\luca@zedo[1].txt
Spyware:Cookie/Xiti Not disinfected C:\Documents and Settings\Luca\Dati applicazioni\Mozilla\Firefox\Profiles\8cmx726u.default\cookies.txt[.xiti.com/]
Spyware:Cookie/Tradedoubler Not disinfected C:\Documents and Settings\Luca\Dati applicazioni\Mozilla\Firefox\Profiles\8cmx726u.default\cookies.txt[.tradedoubler.com/]
Spyware:Cookie/WebtrendsLive Not disinfected C:\Documents and Settings\Luca\Dati applicazioni\Mozilla\Firefox\Profiles\8cmx726u.default\cookies.txt[.statse.webtrendslive.com/]
Spyware:Cookie/Serving-sys Not disinfected C:\Documents and Settings\Luca\Dati applicazioni\Mozilla\Firefox\Profiles\8cmx726u.default\cookies.txt[.serving-sys.com/]
Spyware:Cookie/QuestionMarket Not disinfected C:\Documents and Settings\Luca\Dati applicazioni\Mozilla\Firefox\Profiles\8cmx726u.default\cookies.txt[.questionmarket.com/]
Spyware:Cookie/Mediaplex Not disinfected C:\Documents and Settings\Luca\Dati applicazioni\Mozilla\Firefox\Profiles\8cmx726u.default\cookies.txt[.mediaplex.com/]
Spyware:Cookie/Serving-sys Not disinfected C:\Documents and Settings\Luca\Dati applicazioni\Mozilla\Firefox\Profiles\8cmx726u.default\cookies.txt[.bs.serving-sys.com/]
Spyware:Cookie/Doubleclick Not disinfected C:\Documents and Settings\Luca\Dati applicazioni\Mozilla\Firefox\Profiles\8cmx726u.default\cookies.txt[.doubleclick.net/]
Spyware:Cookie/Atlas DMT Not disinfected C:\Documents and Settings\Luca\Dati applicazioni\Mozilla\Firefox\Profiles\8cmx726u.default\cookies.txt[.atdmt.com/]
Virus:Trj/Downloader.MDW Disinfected C:\Documents and Settings\Luca\Impostazioni locali\Temp\693487.exe
Virus:Malware Generic Disinfected C:\Documents and Settings\Luca\Impostazioni locali\Temp\729649.exe
Adware:Adware/LinkOptimizer Not disinfected C:\Documents and Settings\Luca\Impostazioni locali\Temp\962694.exe
Adware:Adware/GoodSearchNow Not disinfected C:\Documents and Settings\Luca\Impostazioni locali\Temp\spoolsv32.exe
Adware:Adware/GoodSearchNow Not disinfected C:\WINDOWS\csrs.dll
Adware:Adware/GoodSearchNow Not disinfected C:\WINDOWS\csrs.exe
Adware:Adware/GoodSearchNow Not disinfected C:\WINDOWS\system32\~.exe