Hi All, Im new user to TechSpot and hope i can get a solution here. Im Uditha and I bought a ACER Aspire M1640 System recently. And installed XP on it and I used the system for 2 weeks with XP(Installed with Nvidia drivers externally with Floppy DD). After 2 weeks time when i try to start my PC, it got stucked in the boot screen for long time, Then I re-started it in safemode and restored the system and restarted, but the problem exists. Then I tried to install Vista home edition, but that installation also starts and stucked in halfway. Then i tried to install XP again. same problem. Finally anyhow I was able to install XP(after some re-start attempts) But Still the booting problem there.But it boots in safemode. Some times during the boot process in normal mode, it re-starts but not booting in to. Last known configuration also not working. Pls give me instructions. Will it be a RAM issue? or any viruses attacked to BIOS?? Help me. Thanks.