AVsystemcare but not fully installed

I got an install bar for AVsystemcare come up on my desktop trying to install itself. I realised it was something nasty and cut my internet connection thus stopping the installation at about 75%.

Although it doesnt seem to have fully installed I get registry error messages when starting the PC and after a while it crashes with an error message after getting very slow.

I can not use many of my programs anymore and this includes not being able to re-establishing my internet connection via Netgear.

I have a couple of icons appear on my desktop (windows update as well as help and support center) which try and take me to a site called storageprotector.com unsuccessfully (no internet). These both reappear if deleted. The machine also makes periodic attempts to get itself online (unsuccessfully).

All methods Ive found to remove the malware seem to involve downloading a program which i cannot do (no internet).

Does anyone have any idea how I can fix this? It seems to have not downloaded and installed itself fully but still managed to damage my PC.