ashishsinglaca ...... Glad to hear that your machine is back to normal.......
Now then ....what software to keep and use on a regular basis.......
I would suggest the following:
ccleaner ....... I would run a scan with the cleaner part, several times a week ......
Spybot ......... check for updates once a week and then run a full scan.
Your anti-virus program, whatever your using, be sure and check for updates regularly....... also make sure it's configured to monitor : mail in and out , all internet downloads and all instant messenger services. I woud run a full scan at least once a week.
AVG antispyware........ remember that after the 30 day trial is over it still works as a manual scanner ....... so remember to update it on a regular basis. Run it at least every 2 weeks , more often if you notice things not right.
hijackthis ..... I would definately keep this one as it is a good indicator of whats going on in your system........ It won't find everything, but is very good.
You asked about how do you know if your system is clean now.......... run a scan with hijackthis and post it here ........
You should also remember that there isn't currently any one program which will do it all. Thats the reason for using more than one program.
Re anti-virus programs...... You should only have one active anti-virus program. It's ok to have several installed, as long as only one is active.
dl65