Acer eRecovery, what to do?

After a sudden BIOS reset (cause unknown) Windows 7 didn't boot anymore. Replacing the CMOS battery did not help. The message 'BOOTMGR is missing' is persistent. Reinstalling the OS did not work with my Acer eRecovery dvd. I get the message there is insufficient disk space for the required temporary files. I can see this 0.1 GB partition when booting from Partition Wizard. This is what I see:
Disk 1. Capacity Used Unused
PQSERVICE 13 GB 9.22 GB 3.78 GB
ACER 100 MB 9.73 MB 90.22 MB
Acer 225.95 GB 92.8 MB 225.86 GB
DATA 226.71 GB 103.1 GB 123.61 GB

I formatted the third partition (Acer) but Acer eRecovery still gives the same error of insufficient disk space.
What should I do? I really really don't wanna delete my DATA partition. Can I delete the other partitions, including the hidden PQSERVICE partition??

Please help me, I'm already spending days at this and contacting Acer Support myself does not help me either..