Hello and welcome to Tom's Hardware Forums.
If you used an HP CD to revert to factory settings, put it in again and see if it includes a repair option. If it's a Windows XP CD it will definitely have that facility. Either way, if you can get to a Command Prompt - try tapping Function 8 as you power up the machine and see if you get the Advanced Boot menu - try typing this at the C:\ prompt
expand bootmgr temp then press Enter and at the next C:\ prompt, type
attrib bootmgr -s -r -h and press Enter again,. Restart and post back what happened next.
Thank you but no luck- can't get it to a C:\ prompt. didn't use an hp CD - netbook doesn't have a disk drive. Did it with Roxio the preinstalled program on the netbook.