Windows 7: Can I delete or edit the file clr.lst

Not sure if this question has been asked before or not. My computer was/is infected with some rubbish search engine - Claro. I have followed all of the possible solutions I have been able to find on the internet but to no avail.
Have deleted files, registry keys etc., but still it pops up on opening Firefox. It does not, however, show when using IE [which I do not use generally but did so as a test]. The only place I have found any reference to this abysmal virus is in the clr.lst file and I am not sure if it is permissible or wise to delete the file or even to edit it since I am not sure of it's purpose. Searching for what/why of clr.lst is as futile as looking for an honest pollie.

where is this clr.lst stored ??

rename it and see !

Did you check Firefox Add-ons?

Firstly, an apology. The file in question was named clrList............my eyes [and spectacles] are not as good as they used to be and I misread it. However I did modify it by deleting all references to isearch which I understood was one of the items of Claro. The thing is still loading when I open Firefox. I have, as stated, followed every suggestion I was able to find on the internet including, naturally the first check, Firefox addons. There is no reference to this thing anywhere that I can find on my machine so I am getting real antsy. If I lived in Israel, where this bunch of misfits appears to be registered, I would probably be considering a visit to Montera with an IED. Perhaps the arabs have been having problems with Claro - would explain a lot.

Follow the below steps to remove Claro

1. On the firefox address bar type "about:config"

2. Accept the warning and move forward

3. Search for "Keyword.url"

4. You should probably have claro in the value

5. Change it to "http://google.com/ncr"

6. Also go to Tool > Options under "General" change the Homepage to "Restore to Defaults"

7. Install Malwarebytes and run it

6. Remove you current Antivirus and run MSE ( Microsoft Security Essential)

Let me know how it goes .

Well, thanks for your suggestions but as I thought I made clear in my posts I have done everything that has been suggested in forums etc., including all of the above. There is no reference to this evil machination anywhere on my machine but it still comes up when I open Firefox. About:config "keyword.url" is blank and no matter to what I change it, next time Firefox opens it is blank again. Each time I change the Homepage to "Restore to Defaults" or even put my own homepage in, or whatever, each time I open Firefox Claro search is back again. I even checked the files in the Firefox directory, ran Malwares, Spybot and MSE but to no avail. Maybe the next trick would be to uninstall Firefox and re-install or perhaps take up gardening.

yes please reinstall firefox...

use revo uninstaller or iobit uninstaller to remove firefox completely

Actually I backed up my files with Mozbackup and uninstalled without deleting my personal settings before the second of the posts was seen. I still got Claro. I uninstalled again and deleted my personal settings and after a re-install still got Claro. Now I see that I should use an uninstaller other than Windows Control Panel..............Oh well, here goes but I may not respond further 'til tomorrow........zzzzzzzzzzzzzz!

heres... what you do...

install firefox first..... and then use the uninstaller like iobit or revo to remove all the files related to firefox, registry entries...etc...

if that doesn't still solve your problem... let me know... i will try via teamviewer to help you out...