Acer 5742G

I have a big problem which is:I by accident deleted small partition which seems to be the one whit boot file for my hidden partition of windows 7 home premium 64bit and cant reinstal the windows itself .Is there any way to recover it?As I cant find my recovery disk (3 years passed from then).I tryed even to instal eRecovery but it allways shows problems like : "eRecover cant be instaled -1.Bootable File"-the new version ,the older ones says old NAPP version or mising D2D... .

So is there any1 who can help me whit that or have some idea,link-realy anything I would be grateful.(I am not that good whit things like that but shoot wot ever you think might help) Tnx in advance.