Thanks Vikram, Cycletech and Mick for your guidance. Vikram, I have read some of other posts and have found it very useful. Have printed some of them to learn more about this world. I am from medical world:-)
Regarding my problem. I tried downloading the rapid release versions. The first time on both the computers (infected and uninfected), it showed the error that "some installation files are corrupt. Please download a fresh copy and retry the installation". I downloaded the version from the 4th folder, was able to run it on the uninfected computer. On the infected computer, again the same msg as before. During both attempts, it also showed some extraction process and said CRC failed in VIRSCAN.ZIP. The file "???" header is corrupt. The process would installation would pause in between. BTW my virus definitions were updated yesterday using the live update. I dont know the difference between this rapid release update and the regular live update.
I then downloaded the Malwarebytes on the uninfected computer and then using a flash drive, tried to install it on the infected computer, but the virus would not let it run.
Finally I tried the broad-spectrum anti-viral suggested by cycletech---Norton Power Eraser tool. It wanted the internet connection. I was scared, but there was no choice. It found 4 risks: inojaduxoxuxuvi.dll , poronpi.dll, chknon32.dll and command. It has also sent this information to symantec. It asked to restart the system to fix them. After restart, it was able to get rid of the first two, but not the chknon32.dll and command. The good news is that after this, I was able to run malwarebytes. Currently the Malwarebyte is running, it has detected 1 Object infected so far. I disconnected the internet just now and am letting the malware to run. Once that part is done, I will install that patch for vista, which would allow me to go into safe mode. I hope I can get into safe mode and run the scan and get rid of these two bugs. The only fear being, if the broad-spectrum anti-viral was not able to get it out, would malwarebyte or safe mode scan, be able to get rid of them.
Mick, if none of this work, I might have to try your option. I will have to do it on this saturday--will need some time to understand it. BTW my symantec anti-virus is the one, which I got from my grad school, as our laptops were using the school's wireless system. I dont know what is SEP. Also, I have moved out of the school. They have given us the program on one CD
Any suggestions friends?
Regards,
Sohag