Hello jaybee and welcome to BC.
QUOTE
how about clearing all previous restore except the current. can that be done?
When you turn of System Restore (SR) all the restore points are deleted. Turning it back on will create a new restore point. So, if you do this without rebooting, you will have a current restore point.
QUOTE
If the System Volume Information Folder is on an NTFS partition, the SVI directory can be accessed by a virus utility to clean an infected file as any other part of the file system. If the System Volume Information (SVI) folder is on a FAT partition and a virus infected file has been detected or copied to the data store before it was cleaned, the data store needs to be purged to remove the Restore Point with the infected file.
That is from Microsoft. So it depends on the file system you are using, whether or not you need to delete the restore points.