My taskbar it coul not be seen and the Start service doesn't work

Just install tune up utilities and select option solve problems... nothing more... use quick heal antivirus 2009. and try it' anti malware

Did you do a System Restore? You can do it easily by going to safe mode. First do that. Restore the PC to an earlier day.
Download one of these and scan your machine.
Bitdefender OL Scanner
Kaspersky OL Scanner.
These are currently the best AV suites.
Or you can get a free trial and scan the machine.
Do a Disk Cleanup also.
These are the keys of the registry which caused the thing.
The problem of your system is related to Windows Explorer.
Are you able to get the task manager?
Can u see hidden System Files and folders?
(By going to My Computer and tools->folder options->View->Hidden Protected OS files(recommended)->Remove the tick->Apply->OK), such as System Volume folder in the root drive?
If you can't, still the virus is there.
You can connect us for further details and support.
Please rate the answer if it helps you to sole your problem.
Its a pleasure to help you.
Thanks.
Good Luck.
:)

Hi speracoldea,

Sorry to hear about that. You could perhaps fix it using Spybot S&D (from http://security.kolla.de) and poking around in the registry to restore your lost functionality, but in my long experience of doing this you will be FAR better off biting the bullet, splashing out on a new hard drive, putting a fresh copy of Windows on, then installing your old drive as a secondary disk and pulling off any data you want to preserve. Then you can format the old disk and use it for additional storage, scratch disk, whatever. Your computer will be rejuvenated - it's amazing what a performance gain a new drive will give you.

This is probably not the advice you wanted to hear, but trust me, you'll save yourself an enormous amount of time and trouble if you take it.

Good luck,
mousemusic