I have a wee problem.
Firstly the problem is on a netbook.
I was browsing the web with Chrome, and my firewall notified on allowing java access, and without thinking I allowed.
So then Chrome starting lagging and wouldn't load anything. So I tried IE and it worked but my firewall said I was blocked from being redirected.
So after looking around, doing scans etc. I found info on atapi.sys file and it had been modified on the date of the infection. So I tried deleting it and replacing it with a copy I have on my PC, the reason I have a copy on my PC is because I installed XP on the netbook with a pendrive.
I should of known better

I have put the copy of XP back on the pendrive and tried booting from it but no joy.
I would prefer not to have to re-install windows, any help would be much appreciated.