Completely Stumped!

I have an infection. Thing is though I can't run any of my Malwarebytes, Spybot or AVG to get rid of it. I have no idea what it is either because I can't get on to task manager. All I know is I keep getting the same 'Your computer might be at risk' message and what looks like a web page sometimes pops up. Also I get repetitve red crosses and messages (as above) in my taskbar.
It might be something as simple as starting up in safe mode and trying to run my Malwarebytes from there. I don't knbow which F key to press at startup, i've tried F8 but this doesn't seem to work.
Please help......

This worse than i thought. I can't run Hijack this and I can't do a system restore either as well as all the other malware software I can't run (As above). One of the messages I get flashing up looks like its from the Windows security center which its clearly not. Strangely though I can use Firefox but not Internet explorer. although this doesn't stop the meassages. If I could get into task manager i might be able to see whats eating up all my processing power, but I can't, any ideas anyone.

It appears to be using wscntfy.exe. It will only let me open task manager for about 1 second, enough, after about 20 attempts to see what was running unusually. 30 perc ent seems to be a lot for this programme.
Also i appear to have lost my safe mode on re boot.
What a mess......Should I still be on the internet, what I am potentially putting at risk?

[img]file:///C:/DOCUME%7E1/richard/LOCALS%7E1/Temp/moz-screenshot.png[/img][img]file:///C:/DOCUME%7E1/richard/LOCALS%7E1/Temp/moz-screenshot-1.png[/img]
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