I am going to work my way through the advice given about checking my system, but I wanted to explain my problems in case anyone think of a solution.
1) Firstly my computer is being slow. It spends a lot of time whirring to itself.
2) Whenever I try to write a message or reply to an email (using Wanadoo Webmail) it freezes for about a minute and whirrs away. When it eventually responds, when I tryto delete in the webmail, it leaves the deleted text up on the screen and just moves the cursor!
3) It often is very slow and freezes when I try to open a website. This is not every time though.
I have already run a lot of removal software. Ewido found something called rpcnet / rpcnetp, but it keeps reappearing in my System32 folder. There are a lot of processes that I am not sure what they are in my Hijack this log (though I am no computer expert), Also I am running ZoneAlarm and that tells me that something called Generic Processes for Win32 Services is constantly running.
I hope that this can be solved. Thank you!