Grateful for the prompt reply .
1. It is obvious -and very much regretted - that I was not elaborate enough in stating my problem. The factual situation is that I downloaded Spybot S&D (SS&D) on 21 February 2008. The other software (Rogue Remover and AVG Anti- Spyware) were also downloaded at about the same time. Prior to that, I was using the paid version of Trend Mico PC-cillin and switched over to the freeware on expiry of the 15-month contract.
2. The article I referred to, mentioned that in the worst-case scenario I might have to go file by file and remove the parasite(s) embedded therein. However, I was lucky, and the various parasites were eliminated just as I installed, updated and used the above programs for first scan. One exception has been the Black & White item “HKEY_LOCAL_MACHINE\Software\Microsoft\Current Version\Run\Flashy Bot=”, which is apparently resident in a flash memory stick. Every time I use it, both SS&D and AVG remove it but somehow it does not get removed from the flash memory itself. I guess, these utilities only remove it from the affected files on my computer when I read the flash memory but do not make any change on the flash memory itself. The other exception has been the virus Win32/Virut, which is sent to the virus vault by AVG on almost every run but keeps re-appearing under modified names in different files.
3. The mistakes that I made in allowing changes in the registry without ensuring that the decisions would be remembered were only in the first day or two of use of SS&D before I got a hang of the program (Not that I am much wiser now, but definitely more careful!). Later, I became wary of allowing any change as advised by 129260, and, in any case, not doing anything without leaving a record of the decision made.
4. It did occur to me to use System Restore after a few days of unsuccessfully trying to retrieve the lost registry items. However, when I did that, all the malwares that had been deleted came back as mentioned by Zenobia – and I also lost a few programs that I had downloaded/installed in the meantime. Today, I took the risk once again and tried to restore the system from a date prior to 21 February but the system won't do it. I guess, it can do that only for a limited period in the past.
5. My questions are:
a) How can I remove a parasite from a removable memory?
b) Windows XP allows repair/rewriting of registry entries via Command Prompt, which requires the Windows Installer. Since my Windows is factory loaded and thus I do not have the CD(s), I have downloaded this Installer from Windows Update but Windows cannot open it. I was directed to a site which downloaded RegCure, which I feel I am not competent to use. What are my options?
c) One option is to reinstall the system from a link provided in the computer but this will restore the computer to the state in which it was shipped. I will lose all programs installed and work done since then.
Once again in an effort to explain the problem in detail, I have got very lengthy. I am sorry for that.
amirali1928[UNQUOTE]