System Volume Folder

Your virus scanner may have already dealt with the virus the first time it detected it which explains why your follow up scan came up clean.

To have a look inside the System Volume Information folder, disable simple file sharing (through windows explorer, tools, folder options, view tab) and then give yourself access to the folder by right clicking and selecting sharing and security, then click on the security tab.

If the infected file is gone, then your virus scanner has done it's job. If not, update your scanner and run another scan.

I have the correct answer as this has happened to me. follow these steps.
1.restart your computer in safe mode.
2.find the system volume folder, right click on it and click properties.
3.once properties has opened, click the security tab.
4. on the security screen, click the add button, then type your user name in the large white box.
5. click cheak name.
6.once your user name has been added, tick the box, next to full access.
7.click OK.
8.restart your computer again, in its normal state.
9.now click the system volume folder, you will have complete access to it.
10.delete the folder where the virus is present, mine was in RP55. so i deleted that folder.
p.s. i haven't seen any damage done to my computer, so don't worry about deleting the folder, just do it.