I have both Security TOol and backdoor.bot on my PC. I apologise for not running the system scan but I am not on my infected PC at the moment. I have run malwarebytes and "deleted" security tool but backdoor.bot keeps coming back. I have also run avast on boot up but couldn't find the results but it hasn't deleted backdoor.bot. I've never got malwarebytes to actually finish. It often freezes. I'm not sure if thats malware on my creaky PC or sometimes it might be PC Guard/ WIndows defender starting a rival scheduled scan. I wonder is it worth buying the paid for version of Spyware doctor fo make sure Security Tool is gone ( I bet its not though it doesn't bag with bogus mesages any more) and Spyhunter to remove backdoor.bot (I saw someone suggest it though Spyhunter seems to have mixed feedback) many thanks for any help

You don't have to buy Spyware Doctor. Google provides a free version of this program. http://pack.google.com/intl/en/pack...

When you searched the net, most results pertaining to "security tool" may lead you to a website that was optimized to sell spyware doctor. If the website you have visited is promoting to buy a program, leave it as soon as possible. It may not help you, only thing they differ from rogue program developers is the software they carry, the method to fool users to buy the program first is the same. There are other forums and websites that offers free tools. This one help me get rid of security tool for free. http://www.im-infected.com/rogue/se...

thanks for your link, ignys, and thanks for your post xpertise. you may be right re spyware doctor, though wikipedia says it got the "PC World Best Buy award in the October 2007 " and I thought its reviews were good - better than some others. anyway I have a bigger problem now - I did install the premium spyware and try and remove security tool. I then turned off my PC and turned it on later fine. So probably its unconnected to SD but now my PC *won't turn on" - at least it sounds like its on but the monitor is blank saying it gets no signal - its a Hannspree monitor that communicates with the PC during bootup - I wonder if the malware has corrupted a monitor driver or whether with all the recent rough treatment some components has just failed. I think it might be beyond me now even with the help of you kind experts - I might try and take it to a PC repair shop this w/e if by some miracle it doesn't spark into like. I have had the PC 2 years so its not v old or new - maybe I canget a Windows 7 PC next time