Which operating system? Which antivirus program are you using? What is the name of the virus/worm/trojan in each of the files detected? Have you run a full system scan while in Safe Mode? If not, please do.

The are a few different viruses that use the "bootloader.exe" file. Once such is at the link below:

http://www.symantec.com/security_response/writeup.jsp?docid=2003-020518-0826-99&tabid=2

Have you used a trojan/spyware detector on the computer? If not, then please download, install, update, then restart in Safe Mode and run a full system scan using the free program at the link below:

AVG Antispyware 7.5 Tool

Hope this helps and let us know more.

Grif