I deleted too much stuff off my 1g emachine desktop and now it wont even start windows says its missing the boot manager. how can i fix it without a backup disk

Here is thread that may be helpful...
http://answers.microsoft.com/en-us/windows/forum/windows_vista-system/missing-boot-manager/6d2d2f04-8b02-446c-8045-f3638f2ca600
and this...
http://pcsupport.about.com/od/findbyerrormessage/a/bootmgr-is-missing.htm

Boot in safe mode (Press F8 over and over while your computer is booting up). From there, go to your device manager and roll back the driver on this device.

Device Manager is in control panel, hardware and sound, then it's at the top under Devices and Printers.

Go to Device manager n see if any driver is missing or requires update.

Sorry to tell you that you need to repair your installation of windows and for that the disc is required.

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Need for windows reinstall, format and reinstall (Normaly serious virus problems)

you have to re install the windows repair only so that the old files wont not be deleted

Your hard drive is bad. It will keep crashing until you replace it.

Your machine has two ways of repair: SYSTEM RESTORE and SYSTEM RECOVERY. System restore is a Windows utility that rolls the machine back to a point where the machine worked before the problem. System recovery is an eMachines tool that puts the machine back the way it was when you first got it. Restore wont delete your data, recovery will and can. If the problem is catastrophic, and youve backed up your data off of the machine, use the recovery option. Your recovery partition (or a recovery disk) is needed to do this, and it involves pressing a key while the computer boots up. Check your documentation for your model of machine.

The hard drive needs to be low level formatted, fdisk'd and FAT32 formatted prior to ME install. I don't know where to get free copies, but I've used both On Track's drive manager and Acronis v10. Bothe are very good your purposes. Both retail +- $50.00

you can often fix it right back up using the original Vista installation disk. Which comes with a pretty extensive System Recovery Tool that's got lots of options. Set your computer to boot from DVD (using the Boot setting in the BIOS), insert the disc and restart. Vista will prompt you for language and keyboard layout options, then ask if you want to reinstall Vista or repair your installation. You want Repair. From there Vista's System Recovery Tool will take over. this is the only way to get back from the dreaded boot manager missing error.