Why does the virus or worm reappear to same place even I choose delete?
This might happen for example if the malware (worm/trojan/backdoor etc) uses Windows network and drive shares that are behind weak password to spread. An example of this is Randex worm:
Change all passwords in your computer to good ones, and remove unneeded user accounts. This is the way to prevent reinfection. Other option is to install a firewall (included for example in F-Secure Internet Security and F-Secure Anti-Virus Client Security) and block Windows network shares with this.
If the virus warning keeps reappearing every time you start a browser, change the home page to some different. This is especially if the full path to infected files includes text "Temporary internet files" or for example "Cache". Warning comes then probably then from the HTML document that contains malicious code segments. An example of this is warning is Iframe exploit:
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